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Goodwill and Intangible Assets - Additional Information (Details) $ in Millions | 9 Months Ended
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Jun. 30, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract] |
Write off of intangible assets | $ 35

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- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Intangible Assets, Writeoffs + References No definition available. + Details
Name: | wmg_IntangibleAssetsWriteoffs
Namespace Prefix: | wmg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration