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Long-Term Debt - Narrative (Details)
3 Months Ended 6 Months Ended
Jul. 01, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Jan. 31, 2020
USD ($)
Debt Instrument [Line Items]              
Total long-term debt (including current portion)   $ 1,620,000,000   $ 1,620,000,000   $ 1,495,000,000  
Debt instrument, period payment, percentage of principal amount 0.0025            
Loss on extinguishment of debt   2,122,000 $ 0 2,122,000 $ 0    
Secured Debt              
Debt Instrument [Line Items]              
Debt instrument, face amount $ 600,000,000            
Secured Debt | LIBOR              
Debt Instrument [Line Items]              
Debt instrument, alternative basis spread on variable rate 0.0100            
Secured Debt | Minimum | LIBOR              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 2.00%            
Secured Debt | Maximum | LIBOR              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 0.50%            
Interest rate swaps | Designated as Hedging Instrument              
Debt Instrument [Line Items]              
Derivative, notional amount   200,000,000   200,000,000     $ 400,000,000
2013 Senior Notes              
Debt Instrument [Line Items]              
Loss on extinguishment of debt       2,100,000      
Revolving Credit Facility | 2012 ABL Revolver              
Debt Instrument [Line Items]              
Total long-term debt (including current portion)   20,000,000   20,000,000   $ 0  
Borrowing capacity   $ 104,600,000   $ 104,600,000