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Related Party Transactions - Additional Information (Details) € in Millions			12 Months Ended
	Apr. 13, 2022 EUR (€) shares	Jan. 01, 2015 GBP (£)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Oct. 01, 2018 USD ($) shares
Related Party Transaction [Line Items]
Remaining lease term			7 years	8 years
Extended lease term			15 years
I2PO
Related Party Transaction [Line Items]
Business acquisition, number of shares acquired (in shares) | shares	900,000
Final purchase price | €	€ 9
Fair value of equity interests			$ 17,000,000
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
Access Industries
Related Party Transaction [Line Items]
Management fees and reimbursed expenses			0	$ 0	$ 7,000,000
Building
Related Party Transaction [Line Items]
Related party transactions, annual rent payments			$ 14,000,000
Remaining lease term			8 years
Extended lease term			10 years
Streaming Service License | Deezer
Related Party Transaction [Line Items]
Related party revenue			$ 36,000,000	42,000,000	42,000,000
PEDL And Latin America Licenses | Deezer
Related Party Transaction [Line Items]
Related party revenue			$ 2,000,000	$ 2,000,000	2,000,000
One-Time Termination Fee | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party					$ 60,000,000
WMG China | Tencent Music Entertainment Group
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

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