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Long-Term Debt (Narrative) (Details) - USD ($)
Sep. 30, 2019
Mar. 31, 2019
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 1,754,171,000 $ 1,798,598,000
2016 Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 6.375%  
2013 Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate (percent) 5.375%  
Revolving Credit Facility | 2012 ABL Revolver    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 29,000,000.0  
Line of credit facility, additional borrowing capacity $ 125,000,000.0