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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 11, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 21, 2018
Feb. 19, 2016
Dec. 17, 2013
Debt Instrument [Line Items]            
Long-term debt   $ 1,745,000 $ 1,813,000      
Less unamortized debt costs   (14,700) (14,402)      
Long-term debt, net   1,730,300 1,798,598      
2016 Senior Notes | Senior Notes            
Debt Instrument [Line Items]            
Long-term debt   600,000 600,000      
Less unamortized debt costs   $ (5,800) (4,300)      
Debt instrument, stated interest rate (as percent)   6.375%   6.375% 6.375%  
2013 Senior Notes | Senior Notes            
Debt Instrument [Line Items]            
Long-term debt   $ 0 400,000      
Less unamortized debt costs   $ (3,500) (2,800)      
Debt instrument, stated interest rate (as percent)   5.375%       5.375%
2019 Senior Notes | Senior Notes            
Debt Instrument [Line Items]            
Long-term debt   $ 400,000 0      
Debt instrument, stated interest rate (as percent)   5.125%        
2012 Senior Notes | Term Loans            
Debt Instrument [Line Items]            
Long-term debt   $ 690,000 738,000      
2012 Senior Notes | Term Loans | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate (as percent)   2.00%        
Debt instrument, variable rate, minimum   0.00%        
2012 Senior Notes | Term Loans | Base Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate (as percent)   1.00%        
Debt instrument, variable rate, minimum   1.00%        
2012 ABL Revolver | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate (as percent) 1.00%          
2012 ABL Revolver | Base Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate (as percent) 0.00%          
2012 ABL Revolver | Revolving Credit Facility            
Debt Instrument [Line Items]            
Long-term debt   $ 55,000 75,000      
Less unamortized debt costs   (1,100) $ (800)      
Repayments of long-term debt   55,000        
Revolving credit facility, remaining borrowing capacity   $ 107,300