Business to Business Products Business to Business Segment [Member] Business to Business Segment [Member] Other Contingencies Legal Matters and Contingencies [Text Block] Vested, number of shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Fair Value Measurement [Domain] Fair Value Hierarchy and NAV [Domain] Net (Loss) Income Attributable to Oil-Dri Net (Loss) Income Attributable to Oil-Dri Net Income (Loss) Attributable to Parent Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Other intangibles, net of accumulated amortization of $497 and $385 at April 30, 2022 and July 31, 2021, respectively Trademarks and patents, net The total amount, net of amortization, as of the balance sheet date for 1) the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit and 2) costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Interest cost Defined Benefit Plan, Interest Cost Salaries, Wages, Commissions and Employee Benefits Employee-related Liabilities, Current Statistical Measurement [Domain] Statistical Measurement [Domain] Thereafter Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five Operating Segments Segment Reporting, Policy [Policy Text Block] Dividends Declared Dividends, Common Stock, Cash Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Proceeds from sale of property, plant, and equipment Proceeds from Sale of Property, Plant, and Equipment Forfeitures, weighted average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock Weighted-average remaining lease term - operating leaes Operating Lease, Weighted Average Remaining Lease Term Total Other Assets Other Assets, Noncurrent Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Ultimate Health Care Cost Trend Rate Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Segments [Axis] Segments [Axis] Number Available (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Net Decrease in Cash and Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Entity File Number Entity File Number Amortization of Restricted Stock APIC, Share-based Payment Arrangement, Increase for Cost Recognition Accumulated Other Comprehensive Loss: Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Amortization of intangible assets Amortization of Intangible Assets Weighted-average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Inventories Schedule of Inventory, Current [Table Text Block] Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Accounts payable Increase (Decrease) in Accounts Payable and Income Taxes Payable The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business PLUS the increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction. Subsequent Events [Abstract] Subsequent Events [Abstract] Dividends payable Dividends Payable, Current Granted, weighted average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Pension and postretirement benefits Liability, Defined Benefit Plan, Noncurrent Award Type [Domain] Award Type [Domain] Local Phone Number Local Phone Number ASSETS Assets [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Amortization of Other actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Goodwill, Impaired, Accumulated Impairment Loss Goodwill, Impaired, Accumulated Impairment Loss Granted, number of shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period New Accounting Pronouncements or Change in Accounting Principle New Accounting Pronouncements or Change in Accounting Principle [Line Items] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Retained Earnings Retained Earnings [Member] Debt Instrument [Axis] Debt Instrument [Axis] Deferred Revenue Arrangement, by Type [Table] Deferred Revenue Arrangement, by Type [Table] Prepaid expenses Increase (Decrease) in Prepaid Expense and Other Assets Noncurrent Liabilities Liabilities, Noncurrent [Abstract] Prepaid repairs expense Prepaid repairs expense Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance. Related Party [Axis] Related Party [Axis] Amortization of Prior service costs Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Inventory, Current [Table] Inventory, Current [Table] Capital expenditures accrued, but not paid Capital Expenditures Incurred but Not yet Paid Condensed Consolidated Statements of Comprehensive Income [Abstract] Condensed Consolidated Statements of Comprehensive Income [Abstract] Condensed Consolidated Statements of Comprehensive Income [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Corrections Revision of Prior Period, Error Correction, Adjustment [Member] Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract] Basic Common (in dollars per share) Earnings Per Share, Basic Pension and postretirement benefits (net of tax) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Non-vested restricted stock outstanding, beginning balance Non-vested restricted stock outstanding, ending balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Interest expense Interest Expense, Debt Revenue by Principal Product by Operating Segment Disaggregation of Revenue [Table Text Block] Customer list, net of accumulated amortization of $7,536 and $7,321 at April 30, 2022 and July 31, 2021, respectively Customer list, net Gross carrying amount before accumulated amortization as of the balance sheet date of an asset comprised of customer information, acquired in a business combination or other transaction, having a finite beneficial life. Number Authorized (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Operating cash flows from operating leases Operating Lease, Payments Accounts receivable, less allowance of   $1,149 and $1,174 at April 30, 2022 and July 31, 2021, respectively Receivables, Net, Current Provision for bad debts and cash discounts Accounts Receivable, Credit Loss Expense (Reversal) Other Other Noncurrent Assets Other Noncurrent Assets Plan Name [Axis] Plan Name [Axis] Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Loss on Impairment of Goodwill Loss on Impairment of Goodwill Goodwill, Impairment Loss Entity Small Business Entity Small Business Finite-Lived Intangible Assets, Future Amortization Expense Finite-Lived Intangible Assets Finite-Lived Intangible Assets [Line Items] Reclamation Asset Retirement Obligation [Policy Text Block] Total Liabilities & Stockholders’ Equity Liabilities and Equity Statement, Scenario [Axis] Scenario [Axis] Accounts receivable Increase (Decrease) in Accounts and Other Receivables Deferred Revenue Arrangement Deferred Revenue Arrangement [Line Items] Cash Equivalents Cash Equivalents, at Carrying Value LIABILITIES & STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Property, Plant and Equipment Property, Plant and Equipment, Net [Abstract] Purchases of Treasury Stock Treasury Stock, Value, Acquired, Cost Method Deferred Revenue Deferred Revenue [Domain] Entity Interactive Data Current Entity Interactive Data Current 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four Minimum Minimum [Member] Settlement loss due to annuity purchase Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Gross Profit Gross Profit Effect of exchange rate changes on Cash and Cash Equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Selling, General and Administrative Expenses Selling, General and Administrative Expense Selling, General and Administrative Expense Proceeds from issuance of notes payable Proceeds from Notes Payable Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Address, State or Province Entity Address, State or Province Other Assets Other Assets, Noncurrent [Abstract] Trade promotions and advertising Accrued Marketing Costs, Current Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] Deferred income taxes Deferred Income Tax Assets, Net Current Liabilities Liabilities, Current [Abstract] Revenue Recognition Revenue [Policy Text Block] Revision of Prior Period [Axis] Revision of Prior Period [Axis] Cumulative Translation Adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Debt Debt Disclosure [Text Block] Accumulated Other Comprehensive Income [Abstract] Accumulated Other Comprehensive Income [Abstract] Accumulated Other Comprehensive Income [Abstract] Disclosure of Compensation Related Costs, Share-based Payments Share-based Payment Arrangement [Text Block] Series C Senior Note Senior Notes [Member] Dividends paid Payments of Ordinary Dividends, Common Stock Inventories Inventory Disclosure [Text Block] Leases Lessee, Leases [Policy Text Block] Number of Reportable Segments Number of Reportable Segments Net lease obligation Operating Lease, Liability Other Other Inventory, Gross Document Transition Report Document Transition Report Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Common Stock, Value, Issued Common Stock, Value, Issued Revenue by Principal Product Disaggregation of Revenue [Line Items] Total Other Income, Net Total Other Income, Net Nonoperating Income (Expense) Treasury Stock Treasury Stock, Common [Member] Non-vested restricted stock outstanding, weighted average grant date fair value, beginning balance Non-vested restricted stock outstanding, weighted average grant date fair value, ending balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Postretirement Health Plan Postretirement Health Plan Other Postretirement Benefits Plan [Member] Lessee, Operating Leases Lessee, Operating Leases [Text Block] Total Accumulated Other Comprehensive Loss Accumulated Other Comprehensive (Loss) Income, Balance, beginning Accumulated Other Comprehensive (Loss) Income, Balance, ending Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Restricted Stock Restricted Stock [Member] Payments of debt issuance costs Payments of Debt Issuance Costs Debt Instrument, Maturity Date Debt Instrument, Maturity Date Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Cover [Abstract] Cover [Abstract] Annual Principal Payments Debt Instrument, Periodic Payment, Principal Other comprehensive loss before reclassifications, net of tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Medical Cost Trend Assumption Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Class of Stock [Axis] Class of Stock [Axis] Treasury stock, common shares Treasury Stock, Shares Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Average Shares Outstanding Weighted Average Shares Outstanding [Abstract] Weighted Average Shares Outstanding [Abstract] Accounts receivable from related party Accounts Receivable, Related Parties, Current Payments in Advance, Revenue Recognized Deferred Revenue, Revenue Recognized Net sales to related party Revenue from Related Parties Dividends Declared Per Share (in dollars per share) Common Stock, Dividends, Per Share, Declared Accrued expenses Accrued Liabilities, Current Net Sales Revenue from Contract with Customer, Excluding Assessed Tax (Increase) Decrease in assets: Increase (Decrease) in Operating Assets [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Document Quarterly Report Document Quarterly Report Interest income Investment Income, Interest Common Stock Common & Class B Stock Common Stock [Member] Operating Segment Disclosure Segment Reporting Disclosure [Text Block] (Loss) Income from Operations (Loss) Income from Operations Operating Income (Loss) Operating lease liabilities Operating Lease, Liability, Current 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Two Treasury Stock, Beginning of Period (in shares) Treasury Stock, End of Period (in shares) Treasury Stock, Common, Shares 2025 Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Cumulative translation adjustment Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Non-cash stock-based compensation Share-based Payment Arrangement, Noncash Expense Inventory [Axis] Inventory [Axis] Additional Paid-in Capital Additional Paid-in Capital [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Previously Reported Previously Reported [Member] 2022 Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months Deferred compensation Deferred Compensation Liability, Classified, Noncurrent Accrued expenses Increase (Decrease) in Accrued Liabilities Income tax payments Income Taxes Paid Entity Information Entity Information [Line Items] Other, net Other Nonoperating Income (Expense) Notes Payable, Fair Value Long-term Debt, Fair Value Other liabilities Increase (Decrease) in Other Operating Liabilities Capital expenditures Payments to Acquire Property, Plant, and Equipment Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] CARES Act, 2022 Deferred Payroll Tax Payment CARES Act, 2022 Deferred Payroll Tax Payment CARES Act, 2022 Deferred Payroll Tax Payment Maximum Maximum [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Animal Health and Nutrition Animal Health and Nutrition [Member] Information about principal product: Animal Health and Nutrition [Member] Total Liabilities Liabilities Award Type [Axis] Award Type [Axis] 2023 Finite-Lived Intangible Asset, Expected Amortization, Year One Retail and Wholesale Products Retail and Wholesale Segment [Member] Retail and Wholesale Segment [Member] CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Operating lease payments due within next twelve months as of April 30, 2022 Lessee, Operating Lease, Liability, Maturity [Table Text Block] Common stock, shares issued Common Stock, Shares, Issued City Area Code City Area Code Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Assumptions Used Defined Benefit Plan, Assumptions [Table Text Block] Entity Address, City or Town Entity Address, City or Town Purchase of treasury stock Payments for Repurchase of Common Stock Accumulated Other Comprehensive (Loss) Income by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Overburden Removal and Mining Costs Overburden Removal and Mining Costs [Policy Text Block] Description of accounting policy for overburden removal/stripping costs for mined properties and other mining-related costs. Accumulated Other Comprehensive (Loss) Income Comprehensive Income (Loss) Note [Text Block] Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Principle Amount Debt Instrument, Face Amount Long-term expected rate of return on assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 2006 Plan 2006 Plan [Member] 2006 Plan [Member] Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Pension and postretirement benefits Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Retained earnings Retained Earnings (Accumulated Deficit) Real Estate Tax Accrual for Taxes Other than Income Taxes, Current Selling, General and Administrative Expenses Selling, General and Administrative Expenses, Policy [Policy Text Block] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Revision of Prior Period [Domain] Revision of Prior Period [Domain] Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] New Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Segment Income Segment Income (Loss) Segment Reporting Information, Operating Income for Reportable Segment Segment Reporting Information, Operating Income for Reportable Segment Indefinite-lived trademarks Indefinite-lived Intangible Assets (Excluding Goodwill) Basis of Statement Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Income Tax Benefit (Expense) Income Tax Expense (Benefit) Total Stockholders' Equity Total, Beginning of Period Total, End of Period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Amendment Flag Amendment Flag Equity Components [Axis] Equity Components [Axis] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Tax Identification Number Entity Tax Identification Number Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Total Current Assets Assets, Current Revenue by Principal Product by Operating Segment [Table] Disaggregation of Revenue [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Total Lessee, Operating Lease, Liability, to be Paid Forfeitures, number of shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Inventories Total Inventories Inventory, Net Operating Segments Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Accumulated amortization of customer lists Customer list accumulated amortization Accumulated amortization as of the balance sheet date that pertains to a customer list finite-lived intangible asset. Fair Value Measurement, Policy Fair Value Measurement, Policy [Policy Text Block] Total Adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Product and Service [Axis] Product and Service [Axis] Bleaching Clay and Fluids Purification Bleaching Clay and Fluids Purification [Member] Information about principal product: Bleaching Clay and Fluids Purification [Member] Total Stockholders' Equity Total Accumulated Other Comprehensive (Loss) Income Equity Component [Domain] Short-term operating lease cost Short-term Lease, Cost Net issuance of stock under long-term incentive plans (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Cumulative translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Statement Statement [Line Items] Payments In Advance Up-front Payment Arrangement [Member] Corporate Expenses Corporate Expenses The corporate expenses line represents certain unallocated expenses, including primarily salaries, wages and benefits, purchased services, rent, utilities and depreciation and amortization associated with corporate functions such as research and development, information systems, finance, legal, human resources and customer service. Corporate expenses also include the annual incentive plan bonus accrual. Loss on impairment of patent applications Impairment of Intangible Assets, Finite-lived Net issuance of stock under long-term incentive plans Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Net unamortized debt issuance costs Debt Issuance Costs, Noncurrent, Net Payments to related party Related Party Transaction, Purchases from Related Party Retirement Plan Type [Domain] Retirement Plan Type [Domain] Revenue Recognition [Abstract] Revenue Recognition [Abstract] Pension and postretirement benefits Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Debt Disclosure [Abstract] (Loss) Income Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] Type of Adoption [Domain] Accounting Standards Update [Domain] Schedule of Error Corrections and Prior Period Adjustments Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Accounts payable to related party Accounts Payable, Related Parties, Current Segment Reporting [Abstract] Segment Reporting [Abstract] Pension and Other Postretirement Benefits Disclosure Retirement Benefits [Text Block] Notes payable, net of unamortized debt issuance costs of $212 and $122 at April 30, 2022 and July 31, 2021, respectively Senior Notes, Noncurrent Current maturities of notes payable Senior Notes, Current NEW ACCOUNTING PRONOUNCEMENTS [Abstract] NEW ACCOUNTING PRONOUNCEMENTS [Abstract] NEW ACCOUNTING PRONOUNCEMENTS [Abstract] Title of 12(b) Security Title of 12(b) Security Total Assets Assets Assets Director Director [Member] Plan Name [Domain] Plan Name [Domain] Voluntary contributions Defined Benefit Plan Voluntary Contribution Defined Benefit Plan Voluntary Contribution Interest payments, net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Document Type Document Type Prinicipal Products [Domain] Product and Service [Domain] Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Noncontrolling Interest Noncontrolling Interest [Member] Annual Rate Debt Instrument, Interest Rate, Stated Percentage Industrial and Sports Industrial and Sports [Member] Information about principal product: Industrial and Sports [Member] Net Loss Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Total Noncurrent Liabilities Liabilities, Noncurrent Share-based Compensation Arrangement by Share-based Payment Award Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities Unallocated Assets Other Segments [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Lease cost Lease, Cost [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] 2024 Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three Basic Common (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted Common (in dollars per share) Earnings Per Share, Diluted Segment [Domain] Segments [Domain] Service cost Defined Benefit Plan, Service Cost Deferred Revenue Arrangement Type [Axis] Deferred Revenue Arrangement Type [Axis] CARES Act, Current Payroll Tax Deferral CARES Act, Current Payroll Tax Deferral On March 27, 2020, in response to the COVID-19 pandemic, the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) was signed into U.S. law. The CARES Act provides for, among other things, deferral of the employer portion of social security taxes incurred through the end of calendar 2020. Subsequent Events Subsequent Events [Text Block] Agricultural and Horticultural Agricultural and Horticultural [Member] Information about principal product: Agricultural and Horticultural [Member] Lease, Cost Lease, Cost [Abstract] Total Comprehensive (Loss) Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Year that Rate Reaches Ultimate Trend Rate Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Other Comprehensive (Loss) Income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Less Treasury Stock, at cost (3,535,568 Common and 351,641 Class B shares at April 30, 2022 and 3,192,702 Common and 346,491 Class B shares at July 31, 2021) Treasury Stock, Value Related Party Transaction Related Party Transaction [Line Items] Award Vesting Period (years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Cat Litter Cat Litter [Member] Information about principal product: Cat Litter [Member] Schedule of Restricted Stock Transactions Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Accounts Payable Accounts Payable, Current 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Amortization expense for remainder of current fiscal year Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Inventories Increase (Decrease) in Inventories Cash dividends declared and accrued, but not paid Dividends Payable Common & Class B Stock, Beginning of Period (in shares) Common Stock & Class B Stock, End of Period (in shares) Common Stock, Shares, Outstanding Cost of Sales Cost of Goods and Services Sold Estimated contributions in remainder of current fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Document Period End Date Document Period End Date Common Class B Common Class B [Member] Entity Central Index Key Entity Central Index Key Inventory [Domain] Inventory [Domain] CARES Act, 2021 Deferred Payroll Tax Payment CARES Act, 2021 Deferred Payroll Tax Payment CARES Act, 2021 Deferred Payroll Tax Payment 2026 Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five Stockholders’ Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Total Property, Plant and Equipment, Net Property, Plant and Equipment, Net Prepaid expenses and other assets Other Prepaid Expense, Current Other Other Liabilities, Noncurrent Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Purchases of Treasury Stock (in shares) Treasury Stock, Shares, Acquired Debt Instrument [Line Items] Debt Instrument [Line Items] Trading Symbol Trading Symbol Net (Loss) Income Per Share Earnings Per Share [Abstract] Cost Property, Plant and Equipment, Gross Consolidated Statements of Stockholders' Equity [Abstract] Consolidated Statements of Stockholders' Equity [Abstract] Consolidated Statements of Stockholders' Equity [Abstract] Other assets Increase (Decrease) in Other Operating Assets Amounts reclassified from accumulated other comprehensive income, net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Finished goods Inventory, Finished Goods, Gross Goodwill, Gross Goodwill, Gross Deferred compensation Increase (Decrease) in Deferred Compensation Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Share-based Compensation Expense Share-based Payment Arrangement, Expense Entity Current Reporting Status Entity Current Reporting Status Pension Annuity Purchase Defined Benefit Plan, Plan Assets, Payment for Settlement Condensed Consolidated Statements of Income and Retained Earnings [Abstract] Condensed Consolidated Statements of Income and Retained Earnings [Abstract] Condensed Consolidated Statements of Income and Retained Earnings [Abstract] Entities [Table] Entities [Table] Net (Loss) Income Net (Loss) Income, Including Portion Attributable to Noncontrolling Interest Net Income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Payables and Accruals [Abstract] Inventory obsolescence reserve Inventory Valuation Reserves Loss on the disposals of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment Cash and Cash Equivalents, Beginning of Period Cash and Cash Equivalents, End of Period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share 2023 Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two Current Assets Assets, Current [Abstract] Accumulated amortization of other intangibles TrademarksAndPatentsAccumulated Amortization The accumulated amount of amortization of the costs pertaining to the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit PLUS the accumulated amount of amortization of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Leases [Abstract] Leases [Abstract] Other Current and Noncurrent Liabilities Income Tax, Policy [Policy Text Block] Liability for Payments in Advance Deferred Revenue, Current Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive Income (Loss) [Line Items] Increase (Decrease) in liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Schedule of Accounts Payable and Accrued Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Diluted Common (in shares) Weighted Average Number of Shares Outstanding, Diluted Error Corrections and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Other Comprehensive (Loss) Income Other Comprehensive (Loss) Income Net current-period other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Related Party [Domain] Related Party [Domain] Packaging Packaging Inventory Packaging Inventory Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Five Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other (Expense) Income Nonoperating Income (Expense) [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities Entity Address, Address Line Two Entity Address, Address Line Two Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Vested, weighted average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Entity Shell Company Entity Shell Company Total Current Liabilities Liabilities, Current Class of Stock [Domain] Class of Stock [Domain] Segment Reporting Information Segment Reporting Information [Line Items] Current Fiscal Year End Date Current Fiscal Year End Date Discount rate for net periodic benefit cost Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement [Table] Statement [Table] Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Condensed Consolidated Balance Sheet Parenthetical [Abstract] Condensed Consolidated Balance Sheet Parenthetical [Abstract] Condensed Consolidated Balance Sheet Parenthetical [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Reclassification Reclassification, Other [Member] Trade Receivables Accounts Receivable [Policy Text Block] Freight Accrued Freight Accrued Freight Goodwill Goodwill Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Depreciation and amortization Depreciation, Amortization and Accretion, Net Tax for reclassification adjustment from AOCI for pension and other postretirement benefits Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Inventories Inventory, Policy [Policy Text Block] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Scenario [Domain] Scenario [Domain] Pension Plan Pension Plan [Member] Operating lease cost Operating Lease, Cost Other Accounts Payable and Other Accrued Liabilities, Current Related Party Transactions Disclosure Related Party Transactions Disclosure [Text Block] Pension and Postretirement Health Benefits Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Inventory Inventory [Line Items] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Deferred income taxes Deferred Income Tax Expense (Benefit)