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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 26, 2017
Mar. 31, 2017
Mar. 31, 2016
Feb. 19, 2016
Dec. 17, 2013
Jan. 31, 2012
Debt Instrument [Line Items]            
Long-term debt, gross   $ 2,222,000 $ 1,652,500      
Current portion of long-term debt   0 0      
Long-term debt, gross, excluding current maturities   2,222,000 1,652,500      
Less unamortized debt costs   (28,268) (27,191)      
Long-term debt, net   2,193,732 1,625,309      
2012 ABL Revolver | Revolving Credit Facility            
Debt Instrument [Line Items]            
Long-term debt, gross   90,000 85,000      
Less unamortized debt costs   $ (1,300) $ (1,300)      
Senior Notes | 2016 Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, stated interest rate   6.375% 6.375% 6.375%    
Long-term debt, gross   $ 350,000 $ 350,000      
Less unamortized debt costs   $ (4,600) $ (5,400)      
Senior Notes | 2013 Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, stated interest rate   5.375% 5.375%   5.375%  
Long-term debt, gross   $ 400,000 $ 400,000      
Less unamortized debt costs   $ (4,900) $ (5,400)      
Senior Notes | 2012 Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, stated interest rate           8.125%
Term B-4 Loans | 2012 Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, conditional variable rate 2.50% 2.50% 2.50%      
Long-term debt, gross   $ 1,382,000 $ 817,500      
LIBOR | Term B-4 Loans | 2012 Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate (percent) 2.75% 2.75% 2.75%      
Debt instrument, variable rate, minimum 0.75% 0.75% 0.75%