Document and Entity Information Document Information [Table] Legal Entity [Axis] Entity [Domain] Represents the Retirement Plan No. 002. E B P 002 [Member] Profit Sharing and Savings Plan Document Information [Line Items] Document Type Document Period End Date Entity Registrant Name Entity Central Index Key Amendment Flag STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Investments, at fair value EBP, Note Receivable from Participant Notes receivable from participants EBP, Net Asset Available for Benefit Net assets available for benefits at the end of the year Net assets available for benefits at the beginning of the year Net assets available for benefits STATEMENT OF CHANGE IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] STATEMENT OF CHANGE IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Net realized and unrealized appreciation in value of investments EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Dividend and interest income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Total investment income EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Rollover from other plans EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Employer Employer contribution EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participant EBP, Change in Net Asset Available for Benefit, Increase from Contribution Total contributions EBP, Change in Net Asset Available for Benefit, Increase Total additions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions: EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Distributions to participants EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease Total deductions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase in net assets available for benefits SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Accounting Policy [Table] EBP, Accounting Policy [Line Items] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES DESCRIPTION OF THE PLAN EBP, Description of Plan [Table] EBP, Description of Plan [Line Items] DESCRIPTION OF THE PLAN EBP, Description of Plan [Text Block] DESCRIPTION OF THE PLAN FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Line Items] FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] FAIR VALUE MEASUREMENTS INCOME TAX STATUS EBP, Tax Status [Table] EBP, Tax Status [Line Items] INCOME TAX STATUS EBP, Tax Status [Text Block] INCOME TAX STATUS RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Line Items] RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Line Items] RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Text Block] RISKS AND UNCERTAINTIES SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Line Items] SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Basis of Accounting [Policy Text Block] Basis of Presentation EBP, Investment [Policy Text Block] Valuation of Investments EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants EBP, Expense [Policy Text Block] Administrative Expenses EBP, Payment to Participant [Policy Text Block] Payment of Benefits EBP, Use of Estimate [Policy Text Block] Use of Estimates Disclosure of accounting policy for new accounting pronouncements for employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, New Accounting Pronouncements [Policy Text Block] New Accounting Pronouncements EBP, Investment, Fair Value and NAV [Table Text Block] Schedule of plan's assets fair value hierarchy EBP, Note Receivable from Participant, Allowance for Credit Loss Allowance for credit losses Scenario [Axis] Scenario [Domain] Represents the information pertaining to the first 2% of each participant's voluntary contribution. First 2% Of Each Participant's Voluntary Contribution [Member] First 2% of each participant's voluntary contribution Represents the information pertaining to the next 4% of each participant's voluntary contribution. Next 4% Of Each Participant's Voluntary Contribution [Member] Next 4% of each participant's voluntary contribution Represents the information pertaining to discretionary profit sharing contribution. Discretionary Profit Sharing Contributions [Member] Discretionary profit sharing contribution Information by scenario reported, distinguishing information from actual fact. Includes, but is not limited to, pro forma and forecast. Excludes actual facts. Employee Benefit Plan, Years of Vesting Service [Axis] Represents the information pertaining to service years from years two through four. Employee Benefit Plan, Years of Vesting Service [Domain] Information by years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service, Tranche One [Member] 2 to 4 years of service Years of vesting service in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Years of Vesting Service, Tranche Two [Member] After 4 years of service Statistical Measurement [Axis] Statistical Measurement [Domain] Minimum [Member] Minimum Maximum [Member] Maximum Represents the minimum age criteria for plan eligibility under (employee benefit plan (EBP)). Employee Benefit Plan, Minimum Age For Plan Eligibility Minimum age for Plan eligibility EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Maximum participant contribution (in %) EBP, Participant Contribution, Automatic, Deferral Rate Deferral rate (in %) EBP, Employer Contribution, Matching Percentage Employer matching contribution (in %) EBP, Employer Contribution, Participant Compensation Matched, Percentage Percentage of participant eligible compensation (in %) Represents the minimum service hours period for plan eligibility under (employee benefit plan (EBP)). Employee Benefit Plan, Minimum Service Hours Period For Plan Eligibility Minimum services hours in 12 consecutive months of employment Represents the minimum service period for plan eligibility under (employee benefit plan (EBP)). Employee Benefit Plan, Minimum Service Period For Plan Eligibility Minimum services period Represents the percentage of vesting. Employee Benefit Plan, Vesting Percentage Vesting percentage Represents the period of vesting. Employee Benefit Plan, Vesting Period Vesting period EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Amount of forfeited nonvested accounts used to offset employer contributions EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Amount of forfeited nonvested accounts used to pay Plan related consultation expenses EBP, Forfeited Nonvested Account Forfeited non-vested accounts, balance EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Note receivable, maximum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Note receivable, maximum borrowing percentage Percentage points added to the reference rate to compute the variable rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). EBP, Asset Held for Investment, Participant Loan, Basis Spread on Variable Rate Loan interest spread rate Term of participant loan of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Note Receivable From Participant, Term Loan term Investment Type [Axis] Investments [Domain] Cash and Cash Equivalents [Member] Cash and cash equivalents Mutual Fund [Member] Mutual funds EBP, Employer, Common Stock [Member] Employer common stock O'Reilly Automotive, Inc. common stock Represents the information pertaining to common and collective trusts. Target Retirement Date Common Trusts [Member] Common and collective trusts Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Investments measured at fair value Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value, Inputs, Level 2 [Member] Level 2 Fair Value, Inputs, Level 3 [Member] Level 3 EBP, Tax Determination Letter, Obtained [true false] Determination letter obtained EBP, Tax Determination Letter, Date Determination letter date EBP, Tax Qualification Status [Extensible Enumeration] Tax qualification status Investment, Identifier [Axis] Entity Tax Identification Number Entity tax identification number EBP, Plan Number Plan number EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current Value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Notes receivable from participants EBP, Asset Held for Investment, Participant Loan, Interest Rate Interest rates of notes receivable from participants EBP, Asset Held for Investment Total Investments and Loans EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Asset Held for Investment, Party-in-Interest [true false]