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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 11, 2019
Dec. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Debt Instrument [Line Items]              
Line of credit facility, amount outstanding     $ 1,701,313,000   $ 1,701,313,000   $ 1,798,598,000
Loss on extinguishment of debt     $ 2,155,000 $ 0 $ 2,155,000 $ 0  
2019 Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount   $ 400,000,000.0          
Debt instrument, stated interest rate   5.125%          
2019 Senior Notes | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate     5.125%   5.125%    
2012 ABL Revolver              
Debt Instrument [Line Items]              
Debt instrument, amended term 5 years            
Commitment fee percentage 0.25%            
2012 ABL Revolver | LIBOR              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 1.00%            
2012 ABL Revolver | LIBOR | Minimum              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate, if increased 1.25%            
2012 ABL Revolver | LIBOR | Maximum              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate, if increased 1.50%            
2012 ABL Revolver | Base Rate              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 0.00%            
2012 ABL Revolver | Base Rate | Minimum              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate, if increased 0.25%            
2012 ABL Revolver | Base Rate | Maximum              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate, if increased 0.50%            
2016 Senior Notes | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate     6.375%   6.375%    
2013 Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate     5.375%   5.375%    
Early repayment of senior debt   $ 400,000,000.0          
Loss on extinguishment of debt         $ 2,200,000    
2013 Senior Notes | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate     5.375%   5.375%    
Revolving Credit Facility | 2012 ABL Revolver              
Debt Instrument [Line Items]              
Line of credit facility, amount outstanding     $ 0   $ 0    
Borrowing capacity     $ 153,300,000   $ 153,300,000