SHARE-BASED COMPENSATION AND BENEFIT PLANS (Benefit Plans) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Deferred Compensation Arrangements [Abstract]
Benefit Plans, cost recognized	$ 14.0	$ 13.9

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

No definition available.

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