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Comprehensive Income - Additional Information (Detail) $ in Millions | 6 Months Ended
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Mar. 31, 2024 USD ($)
Equity [Abstract] |
Changes in accumulated other comprehensive loss, net of related taxes amount less than | $ 1

X
- References No definition available. + Details
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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