VARIABLE INTEREST ENTITIES (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2022 USD ($) entity
Variable Interest Entities
Number of unconsolidated tax credit fund entities that were considered to be Variable Interest Entities \| entity	4
Equity method investment in VIEs, net \| $	$ 24.1

The carrying amount of the reporting entity's equity method investment in a Variable Interest Entity included in the reporting entity's statement of financial position.

No definition available.

Name:	orly_VariableInterestEntityEquityMethodInvestmentCarryAmount
Namespace Prefix:	orly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant