XML 95 R50.htm IDEA: XBRL DOCUMENT v3.24.3

Description of Business (Details) - $ / shares	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 05, 2020
Access Industries
Subsidiary, Sale of Stock [Line Items]
Sale of stock, percentage of ownership after transaction (as a percent)	98.00%
Sale of stock, percentage of economic interest (as a percent)	72.00%
Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Class A Common Stock | IPO
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share)			$ 0.001
Class B Common Stock
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share)	0.001	$ 0.001
Class B Common Stock | Access Industries
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.001

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Sale Of Stock, Percentage Of Economic Interest

+ References

No definition available.

+ Details

Name:	wmg_SaleOfStockPercentageOfEconomicInterest
Namespace Prefix:	wmg_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=wmg_AccessIndustriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: