XML 54 R43.htm IDEA: XBRL DOCUMENT v3.23.2

Comprehensive Income - Narrative (Detail) $ in Millions	9 Months Ended
	Jun. 30, 2023 USD ($)
Equity [Abstract]
Changes in accumulated other comprehensive loss, net of related taxes	$ 3

X

- References

No definition available.

+ Details

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

X

- Definition

Changes in accumulated other comprehensive income loss net of related tax.

+ References

No definition available.

+ Details

Name:	wmg_ChangesInAccumulatedOtherComprehensiveIncomeLossNetOfRelatedTax
Namespace Prefix:	wmg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration