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Earnings Per Share (Details) $ in Millions			12 Months Ended
	Mar. 25, 2020 USD ($)	Dec. 26, 2019 USD ($)	Sep. 30, 2020 USD ($) dividend
Earnings Per Share [Abstract]
Number of dividends declared | dividend			2
Dividends, cash, quarterly	$ 37.5	$ 37.5
Cash dividends declared			$ 75.0

X

- Definition

Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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

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

Dividends, Cash, Quarterly

+ References

No definition available.

+ Details

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

X

- Definition

Number Of Dividends Declared

+ References

No definition available.

+ Details

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