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Related Party Transactions - Additional Information (Details)		12 Months Ended
	Jan. 01, 2015 GBP (£)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Oct. 01, 2018 USD ($) shares
Related Party Transaction [Line Items]
Remaining lease term		8 years	8 years
Extended lease term		10 years
Warner and Chappell Music Limited and WMG Acquisition Limited
Related Party Transaction [Line Items]
Extended lease term	5 years
Payments for rent | £	£ 3,460,250
WMG China
Related Party Transaction [Line Items]
Ownership percentage					20.00%
WMG China | AI New Holdings 5 LLC
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by parent					80.00%
WMG China | Tencent Music Entertainment Group
Related Party Transaction [Line Items]
Purchase of ordinary shares (in shares) | shares					37,162,288
Purchase of ordinary shares, value					$ 100,000,000
Access Industries
Related Party Transaction [Line Items]
Management fees and reimbursed expenses		$ 0	$ 7,000,000	$ 11,000,000
Building
Related Party Transaction [Line Items]
Related party transactions, annual rent payments		$ 13,000,000
Remaining lease term		9 years
Extended lease term		10 years
Streaming Service License | Deezer
Related Party Transaction [Line Items]
Related party revenue		$ 42,000,000	42,000,000	49,000,000
PEDL And Latin America Licenses | Deezer
Related Party Transaction [Line Items]
Related party revenue		$ 2,000,000	2,000,000	$ 1,000,000
One-Time Termination Fee | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			$ 60,000,000

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