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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Debt Instrument [Line Items]    
Total long-term debt (including current portion) $ 1,913,000 $ 2,013,000
Less: unamortized debt costs (17,165) (20,048)
Long-term debt, net 1,895,835 1,992,952
2012 ABL Revolver | Revolving Credit Facility    
Debt Instrument [Line Items]    
Total long-term debt (including current portion) 75,000 75,000
Long-term debt, net $ 75,000  
Senior Notes | 2016 Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 6.375%  
Total long-term debt (including current portion) $ 600,000 600,000
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-5 Loans | 2012 Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt (including current portion) $ 838,000 $ 938,000
Term B-5 Loans | 2012 Senior Notes | LIBOR    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate (percent) 2.00%  
Debt instrument, variable rate, minimum (as percent) 0.00%  
Term B-5 Loans | 2012 Senior Notes | Base Rate    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate (percent) 1.00%  
Debt instrument, variable rate, minimum (as percent) 1.00%