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Long-Term Debt - Narrative (Details) - USD ($)
12 Months Ended
Mar. 24, 2020
Mar. 13, 2020
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Long-term debt          
Maximum allowable increase due to accordion feature     $ 200,000,000    
Proceeds from line of credit     771,300,000 $ 667,250,000 $ 521,200,000
Cash and cash equivalents     24,467,000 $ 11,871,000  
Credit agreement          
Long-term debt          
Unsecured total revolving commitment     1,000,000,000.0    
Remaining borrowing capacity on line of credit     671,000,000.0    
Credit agreement | Revolving loan          
Long-term debt          
Outstanding line of credit     320,000,000.0    
Credit agreement | Letter of credit          
Long-term debt          
Outstanding line of credit     $ 9,000,000.0    
Subsequent Event          
Long-term debt          
Maximum allowable increase due to accordion feature   $ 300,000,000      
Cash and cash equivalents $ 393,000,000.0        
Subsequent Event | Credit agreement          
Long-term debt          
Unsecured total revolving commitment   $ 1,250,000,000      
Remaining borrowing capacity on line of credit 536,400,000        
Proceeds from line of credit 200,000,000        
Cash and cash equivalents $ 393,000,000.0        
Minimum | Base rate | Subsequent Event          
Long-term debt          
Margin (as a percent)   0.00%      
Minimum | Eurodollar | Subsequent Event          
Long-term debt          
Margin (as a percent)   1.00%      
Maximum | Base rate | Subsequent Event          
Long-term debt          
Margin (as a percent)   1.00%      
Maximum | Eurodollar | Subsequent Event          
Long-term debt          
Margin (as a percent)   2.00%