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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Debt Instrument [Line Items]    
Total long-term debt (including current portion) $ 2,077,000 $ 2,222,000
Current portion of long-term debt 0 0
Long-term debt 2,077,000 2,222,000
Less unamortized debt costs (23,731) (28,268)
Long-term debt, net 2,053,269 2,193,732
2012 ABL Revolver | Revolving Credit Facility    
Debt Instrument [Line Items]    
Total long-term debt (including current portion) $ 70,000 90,000
Senior Notes | 2016 Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 6.375%  
Total long-term debt (including current portion) $ 350,000 350,000
Senior Notes | 2013 Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 5.375%  
Total long-term debt (including current portion) $ 400,000 400,000
Term B-4 Loans | 2012 Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt (including current portion) $ 1,257,000 $ 1,382,000
Term B-4 Loans | 2012 Senior Notes | LIBOR    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate (percent) 2.75%  
Debt instrument, variable rate, minimum 0.75%  
Term B-4 Loans | 2012 Senior Notes | Base Rate    
Debt Instrument [Line Items]    
Debt instrument, margin step-down 2.50%