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Long-Term Debt (Narrative) (Details) - USD ($)
Sep. 30, 2018
Mar. 31, 2018
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 1,895,835,000 $ 1,992,952,000
2012 ABL Revolver | Revolving Credit Facility    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding 75,000,000  
Line of credit facility, additional borrowing capacity $ 85,000,000.0  
Senior Notes | 2016 Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 6.375%  
Senior Notes | 2013 Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 5.375%