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Long-Term Debt - Schedule (Details) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2021
Feb. 28, 2021
Long-term debt    
Aggregate principal balance $ 514,708 $ 347,607
Unamortized prepaid financing fees (3,734) (3,977)
Total long-term debt 510,974 343,630
Long-term debt, current maturities (1,884) (1,884)
Long-term debt, excluding current maturities 509,090 341,746
MBFC loan    
Long-term debt    
Aggregate principal balance $ 16,708 18,607
Weighted average effective interest rate 1.10%  
MBFC loan | Base rate    
Long-term debt    
Interest rate 1.00%  
MBFC loan | LIBOR    
Long-term debt    
Interest rate 2.00%  
Credit agreement    
Long-term debt    
Aggregate principal balance $ 498,000 $ 329,000
Weighted average effective interest rate 1.10%  
Fixed rate debt $ 225,000  
Credit agreement | Minimum | Base rate    
Long-term debt    
Interest rate 0.00%  
Credit agreement | Minimum | LIBOR    
Long-term debt    
Interest rate 1.00%  
Credit agreement | Maximum | Base rate    
Long-term debt    
Interest rate 1.00%  
Credit agreement | Maximum | LIBOR    
Long-term debt    
Interest rate 2.00%  
Unsecured Senior Notes3.90 Percent Due Jan2018    
Long-term debt    
Fixed rate debt $ 225,000