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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Debt instrument, stated interest rate 5.375%   5.375%
Total long-term debt (including current portion) $ 1,560,000 $ 1,745,000  
Less: unamortized debt costs (11,308) (14,700)  
Long-term debt, net $ 1,548,692 1,730,300  
2019 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, stated interest rate 5.125%   5.125%
2012 ABL Revolver | Revolving Credit Facility      
Debt Instrument [Line Items]      
Total long-term debt (including current portion) $ 0 55,000  
Senior Notes | 2016 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, stated interest rate 6.375%    
Total long-term debt (including current portion) $ 600,000 600,000  
Senior Notes | 2019 Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, stated interest rate 5.125%    
Total long-term debt (including current portion) $ 400,000 400,000  
Term B-5 Loans | 2012 Senior Notes      
Debt Instrument [Line Items]      
Total long-term debt (including current portion) $ 560,000 $ 690,000  
Term B-5 Loans | 2012 Senior Notes | LIBOR      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 2.00%    
Debt instrument, variable rate, minimum 0.00%    
Term B-5 Loans | 2012 Senior Notes | Base Rate      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 1.00%    
Debt instrument, variable rate, minimum 1.00%