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Goodwill and Intangible Assets - Additional Information (Details) $ in Millions	6 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Write off of intangible assets	$ (35)

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- References

No definition available.

+ Details

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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

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Namespace Prefix:	wmg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration