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VARIABLE INTEREST ENTITIES (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) entity
Variable Interest Entities
Number of unconsolidated tax credit fund entities that were considered to be Variable Interest Entities | entity	5
Equity method investment in VIEs, net | $	$ 22.6

X

- Definition

Number of unconsolidated tax credit fund entities that were considered to be Variable Interest Entities

+ References

No definition available.

+ Details

Name:	orly_NumberOfUnconsolidatedTaxCreditFundEntitiesThatWereConsideredToBeVariableInterestEntities
Namespace Prefix:	orly_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-6

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityNotPrimaryBeneficiaryDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration