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