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- Interest Rates (Details) - Credit agreement
$ in Thousands
 12 Months Ended
Feb. 29, 2020
USD ($)
Quarter
Feb. 28, 2019
USD ($)
Feb. 28, 2018
USD ($)
Revolving Line of Credit      
Average borrowings outstanding | $ $ 286,640 $ 290,860 $ 382,960
Average interest rates during each year (as a percent) 3.20% 3.20% 2.70%
Weighted average interest rates on borrowings outstanding at year end (as a percent) 2.70% 3.60% 2.90%
Number of prior quarters used in calculation of average borrowings outstanding | Quarter 4    
Minimum      
Revolving Line of Credit      
Interest rate range during each year (as a percent) 2.60% 2.80% 2.30%
Maximum      
Revolving Line of Credit      
Interest rate range during each year (as a percent) 5.50% 5.50% 4.80%