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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($)
12 Months Ended
Dec. 11, 2019
Mar. 31, 2021
Mar. 01, 2021
Mar. 31, 2020
Mar. 21, 2018
Feb. 19, 2016
Debt Instrument [Line Items]            
Long-term debt   $ 1,495,000,000   $ 1,745,000,000    
Less unamortized debt costs   (15,347,000)   (14,700,000)    
Long-term debt, net   1,479,653,000   1,730,300,000    
2016 Senior Notes bearing interest at 6.375%, with interest payable on March 1 and September 1 of each year. The 2016 Senior Notes mature on March 1, 2024. | Senior Notes            
Debt Instrument [Line Items]            
Long-term debt   $ 0   600,000,000    
Debt instrument, stated interest rate (as percent)   6.375%     6.375% 6.375%
2021 Senior Notes bearing interest at 3.750%, with interest payable on April 1 and October 1 of each year. The 2021 Senior Notes mature on April 1, 2031.            
Debt Instrument [Line Items]            
Debt instrument, stated interest rate (as percent)     3.75%      
2021 Senior Notes bearing interest at 3.750%, with interest payable on April 1 and October 1 of each year. The 2021 Senior Notes mature on April 1, 2031. | Senior Notes            
Debt Instrument [Line Items]            
Long-term debt   $ 600,000,000   0    
Debt instrument, stated interest rate (as percent)   3.75%        
2019 Senior Notes bearing interest at 5.125%, with interest payable on January 15 and July 15 of each year. The 2019 Senior Notes mature on January 15, 2028. | Senior Notes            
Debt Instrument [Line Items]            
Long-term debt   $ 400,000,000   400,000,000    
Debt instrument, stated interest rate (as percent)   5.125%        
2012 Term B-5 Loans bearing interest at the Borrower's option at either LIBOR plus a margin of 2.00%, with a LIBOR floor of 0.00%, or an alternate base rate plus a margin of 1.00%, with a floor of 1.00%, due on January 26, 2024. | Revolving Credit Facility            
Debt Instrument [Line Items]            
Repayments of long-term debt   $ 0        
2012 Term B-5 Loans bearing interest at the Borrower's option at either LIBOR plus a margin of 2.00%, with a LIBOR floor of 0.00%, or an alternate base rate plus a margin of 1.00%, with a floor of 1.00%, due on January 26, 2024. | Term Loans            
Debt Instrument [Line Items]            
Long-term debt   $ 495,000,000   690,000,000    
2012 Term B-5 Loans bearing interest at the Borrower's option at either LIBOR plus a margin of 2.00%, with a LIBOR floor of 0.00%, or an alternate base rate plus a margin of 1.00%, with a floor of 1.00%, due on January 26, 2024. | Term Loans | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate (as percent)   2.00%        
Debt instrument, variable rate, minimum   0.00%        
2012 Term B-5 Loans bearing interest at the Borrower's option at either LIBOR plus a margin of 2.00%, with a LIBOR floor of 0.00%, or an alternate base rate plus a margin of 1.00%, with a floor of 1.00%, due on January 26, 2024. | Term Loans | Base Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate (as percent)   1.00%        
Debt instrument, variable rate, minimum   1.00%        
2012 ABL Revolver bearing interest at the Borrower's option at either a base rate plus applicable margin or LIBOR plus applicable margin. Any unpaid balance is due on December 11, 2024. | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate (as percent) 1.00%          
2012 ABL Revolver bearing interest at the Borrower's option at either a base rate plus applicable margin or LIBOR plus applicable margin. Any unpaid balance is due on December 11, 2024. | Base Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate (as percent) 0.00%          
2012 ABL Revolver bearing interest at the Borrower's option at either a base rate plus applicable margin or LIBOR plus applicable margin. Any unpaid balance is due on December 11, 2024. | Revolving Credit Facility            
Debt Instrument [Line Items]            
Long-term debt   $ 0   $ 55,000,000    
Revolving credit facility, remaining borrowing capacity   $ 132,200,000