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 Income Attributable to Oil-Dri Net 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 $471 and $385 at January 31, 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 Increase (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] 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) 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] Revision of Prior Period, Error Correction, Adjustment 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 $7,464 and $7,321 at January 31, 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   $1,093 and $1,174 at January 31, 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] Goodwill impairment loss 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’ 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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. 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