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Long-term Debt - Term Loans (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 23, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Mar. 31, 2019
Debt Instrument [Line Items]          
Aggregate principal amount outstanding         $ 1,036,314,000
Secured Debt | First Lien Term Loan          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 950,000,000.0        
Maximum net leverage ratio before change in basis spread on variable rate 435.00%        
Required quarterly principal payments         2,400,000
Aggregate principal amount outstanding   $ 581,100,000   $ 581,100,000 $ 947,600,000
Interest rate         5.70%
Secured Debt | First Lien Term Loan | Alternative Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable interest rate 2.25%     1.75%  
Secured Debt | First Lien Term Loan | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable interest rate 3.25%     2.75%  
Secured Debt | Second Lien Term Loan          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 170,000,000.0        
Debt Instrument, Repurchase Amount         $ 57,100,000
Aggregate principal amount outstanding         $ 88,700,000
Interest rate         9.50%
Debt exchanged         $ 56,900,000
Loss on extinguishment of debt   2,700,000     200,000
Secured Debt | Second Lien Term Loan | Alternative Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable interest rate 6.00%        
Secured Debt | Second Lien Term Loan | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable interest rate 7.00%        
Secured Debt | First And Second Lien Term Loans          
Debt Instrument [Line Items]          
Threshold of sale of property or assets that requires loan prepayments $ 5,000,000.0        
Threshold of proceeds received from insurance settlement or new debt agreements that require loan prepayments 5,000,000.0        
Debt issuance costs and original issuance discount $ 15,500,000 10,700,000   $ 10,700,000 14,300,000
Amortization of debt issuance costs and original issuance discount   400,000 $ 200,000 900,000 $ 1,200,000
Secured Debt | First Lien Term Loan, First Rate          
Debt Instrument [Line Items]          
Aggregate principal amount outstanding   $ 30,000,000.0   $ 30,000,000.0  
Interest rate   6.80%   6.80%  
Secured Debt | First Lien Term Loan, Second Rate          
Debt Instrument [Line Items]          
Aggregate principal amount outstanding   $ 551,100,000   $ 551,100,000  
Interest rate   4.80%   4.80%