Related Party Transactions [Abstract] Related Party Transactions [Abstract] Business to Business Products Business to Business Segment [Member] Business to Business Segment [Member] Total Stockholders' Equity Total, Beginning of Period Total, End of Period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Lease, Cost Lease, Cost [Abstract] Leases Lessee, Leases [Policy Text Block] Amortization of restricted stock APIC, Share-based Payment Arrangement, Increase for Cost Recognition Other intangibles, net of accumulated amortization of $483 and $457 at October 31, 2020 and July 31, 2020, 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. 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Purchases of treasury stock (in shares) Treasury Stock, Shares, Acquired Scenario [Domain] Scenario [Domain] Amount Contributed to Purchase of Additional Interest by Parent Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent Curtailment on Pension Plan Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Restricted Stock Restricted Stock [Member] Current Liabilities Liabilities, Current [Abstract] 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 Inventories Inventory, Policy [Policy Text Block] Operating Segment Disclosure Segment Reporting Disclosure [Text Block] Award Vesting Period, Minimum (years) ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPeriodMinimum Mininimum period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition Segment Reporting Information Segment Reporting Information [Line Items] Document Quarterly Report Document Quarterly Report Trade promotions and advertising Accrued Marketing Costs, Current Class of Stock [Domain] Class of Stock [Domain] Treasury Stock Treasury Stock, Common [Member] CARES Act, Future Payroll Tax Deferral CARES Act, Future 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. Reclamation Asset Retirement Obligation [Policy Text Block] Notes payable, net of unamortized debt issuance costs of $143 and $150 at October 31, 2020 and July 31, 2020, respectively Senior Notes, Noncurrent 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. 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Operating Segments Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Bleaching Clay and Fluids Purification Bleaching Clay and Fluids Purification [Member] Information about principal product: Bleaching Clay and Fluids Purification [Member] Deferred compensation Deferred Compensation Liability, Classified, Noncurrent Curtailment gain on SERP Plan Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment Inventories Schedule of Inventory, Current [Table Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] (Gain) Loss on the sale of fixed assets Gain (Loss) on Disposition of Property Plant Equipment Weighted-average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive (Loss) Income Comprehensive Income (Loss) Note [Text Block] 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. 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The CARES Act provides for, among other things, deferral of the employer portion of social security taxes incurred through the end of calendar 2020. Parent Parent Oil-Dri Corporation of America [Member] Parent Oil-Dri Corporation of America [Member] Agricultural and Horticultural Agricultural and Horticultural [Member] Information about principal product: Agricultural and Horticultural [Member] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Provision for bad debts and cash discounts Accounts Receivable, Credit Loss Expense (Reversal) Cat Litter Cat Litter [Member] Information about principal product: Cat Litter [Member] Subsequent Event [Table] Subsequent Event [Table] Current maturities of notes payable Senior Notes, Current Additional Paid-in Capital Additional Paid-in Capital [Member] Interest income Investment Income, Interest 2021 Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two Finished goods Inventory, Finished Goods, Gross Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Cost Property, Plant and Equipment, 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Operating Assets Ownership Ownership [Domain] Payments to related party Related Party Transaction, Purchases from Related Party Dividends paid Payments of Ordinary Dividends, Common Stock 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] Revenue by Principal Product by Operating Segment [Table] Disaggregation of Revenue [Table] Notes Payable, Fair Value Long-term Debt, Fair Value Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Total Liabilities Liabilities Common Stock, Value, Issued Common Stock, Value, Issued Property, Plant and Equipment Property, Plant and Equipment, Net [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. Amortization of Other actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Inventories Increase (Decrease) in Inventories Revenue Recognition [Abstract] Revenue Recognition [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Beginning of Period Cash and Cash Equivalents, End of Period Cash and Cash Equivalents, at Carrying Value Pension and postretirement benefits Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Thereafter Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five Packaging Packaging Inventory Packaging Inventory Basic Common (in shares) Weighted Average Number of Shares Outstanding, Basic Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Equity Components [Axis] Equity Components [Axis] New Accounting Pronouncements or Change in Accounting Principle New Accounting Pronouncements or Change in Accounting Principle [Line Items] Amortization of intangible assets Amortization of Intangible Assets Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Other liabilities Increase (Decrease) in Other Operating Liabilities Forfeitures, number of shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Amortization of investment net discount Accretion (Amortization) of Discounts and Premiums, Investments Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Fair Value Measurements Fair Value Disclosures [Text Block] Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax Finite-Lived Intangible Assets, Future Amortization Expense Finite-Lived Intangible Assets Finite-Lived Intangible Assets [Line Items] Cumulative Translation Adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Contributions from noncontrolling interests Proceeds from (Payments to) Noncontrolling Interests Lease cost Lease, Cost [Table Text Block] Noncontrolling Interest Items [Abstract] Noncontrolling Interest Items [Abstract] Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Postretirement Health Plan Postretirement Health Plan Other Postretirement Benefits Plan [Member] Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Security Exchange Name Security Exchange Name Schedule of Assumptions Used Defined Benefit Plan, Assumptions [Table Text Block] Medical Cost Trend Assumption Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Condensed Consolidated Balance Sheet Parenthetical [Abstract] Condensed Consolidated Balance Sheet Parenthetical [Abstract] Condensed Consolidated Balance Sheet Parenthetical [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock Net Cash (Used in) Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities Ultimate Health Care Cost Trend Rate Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Total Stockholders' Equity Total Accumulated Other Comprehensive (Loss) Income Equity Component [Domain] Freight Accrued Freight Accrued Freight Document Transition Report Document Transition Report Accounts receivable from related party Accounts Receivable, Related Parties, Current Inventory obsolescence reserve Inventory Valuation Reserves Goodwill impairment loss Goodwill, Impairment Loss Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract] Net unamortized debt issuance costs Debt Issuance Costs, Noncurrent, Net