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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 21, 2018
Feb. 19, 2016
Dec. 17, 2013
Debt Instrument [Line Items]          
Long-term debt, gross $ 1,813,000        
Long-term debt, gross, excluding current maturities 1,813,000 $ 2,013,000      
Less unamortized debt costs (14,402) (20,048)      
Long-term debt, net 1,798,598 1,992,952      
2016 Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Long-term debt, gross 600,000 600,000      
Less unamortized debt costs $ (2,800) (5,000)      
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, gross $ 400,000 400,000      
Less unamortized debt costs $ (4,300) (3,700)      
Debt instrument, stated interest rate (as percent) 5.375%       5.375%
2012 Senior Notes | Term Loans          
Debt Instrument [Line Items]          
Long-term debt, gross $ 738,000 938,000      
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 | Revolving Credit Facility          
Debt Instrument [Line Items]          
Long-term debt, gross $ 75,000 75,000      
Less unamortized debt costs $ (800) $ (1,100)