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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Benefit Plans) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Profit sharing and savings plan [Member] | Nonqualified deferred compensation plan [Member]
Share-Based Compensation and Benefit Plans
Benefit plans, cost recognized	$ 14.4	$ 14.0	$ 42.7	$ 40.7

X

- Definition

Amount of expense for the employer contribution to the profit sharing and savings plan and nonqualified deferred compensation plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	orly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: