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Goodwill and Intangible Assets - Additional Information (Details) $ in Millions	3 Months Ended
	Dec. 31, 2020 USD ($) acquisition
Goodwill and Intangible Assets Disclosure [Abstract]
Number of asset acquisitions | acquisition	2
Increase in intangible assets, assets acquired | $	$ 318

X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

Name:	us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Number of Asset Acquisitions

+ References

No definition available.

+ Details

Name:	wmg_NumberOfAssetAcquisitions
Namespace Prefix:	wmg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration