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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 21, 2018
Mar. 31, 2017
Feb. 19, 2016
Dec. 17, 2013
Debt Instrument [Line Items]          
Long-term debt, gross $ 2,013,000   $ 2,222,000    
Current portion of long-term debt 0   0    
Long-term debt, gross, excluding current maturities 2,013,000   2,222,000    
Less unamortized debt costs (20,048)   (28,268)    
Long-term debt, net 1,992,952   2,193,732    
2016 Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Long-term debt, gross 600,000   350,000    
Less unamortized debt costs $ (3,700)   (4,900)    
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 $ (5,000)   (4,600)    
Debt instrument, stated interest rate (as percent) 5.375%       5.375%
2012 Senior Notes | Term Loans          
Debt Instrument [Line Items]          
Long-term debt, gross $ 938,000   1,382,000    
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   90,000    
Less unamortized debt costs $ (1,100)   $ (1,300)