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Merchandise Inventories (Detail) - USD ($) $ in Millions	Feb. 15, 2025	Aug. 31, 2024
Merchandise Inventories
LIFO credit reserve balance	$ 19.0	$ 19.0

The value of (Last in First Out) LIFO inventory reserve as at the end of the reporting period.

No definition available.

Name:	azo_InventoryLifoReserves
Namespace Prefix:	azo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

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