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Long-Term Debt - Narrative (Details) - USD ($)
12 Months Ended
Mar. 13, 2020
Feb. 28, 2021
Feb. 29, 2020
Long-term debt      
Maximum allowable increase due to accordion feature $ 300,000,000 $ 200,000,000  
Long-term debt, gross   347,607,000 $ 340,507,000
Outstanding letters of credit   19,200,000  
Maximum line of credit debt allowed under covenant   901,800,000  
Remaining borrowing capacity on line of credit   874,400,000  
Fiscal 2022   1,900,000  
Fiscal 2023   1,900,000  
Fiscal 2024   14,807,000  
Credit agreement      
Long-term debt      
Unsecured total revolving commitment $ 1,250,000,000 1,000,000,000.0  
Long-term debt, gross   329,000,000 320,000,000
MBFC loan      
Long-term debt      
Long-term debt, gross   $ 18,607,000 $ 20,507,000