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Debt - Notes Offering - Additional Information (Detail) - USD ($)
$ in Millions
Jul. 27, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
5.00% Senior Secured Notes due 2023        
Debt Instrument [Line Items]        
Interest rate   5.00% 5.00% 5.00%
WMG Acquisition Corp. | Revolving Credit Facility        
Debt Instrument [Line Items]        
Prepayment of senior term loan facility $ 295.5      
WMG Acquisition Corp. | 5.00% Senior Secured Notes due 2023        
Debt Instrument [Line Items]        
Face or principal amount of debt instrument $ 300.0      
Interest rate 5.00% 5.00% 5.00%