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Long-Term Debt - FV, Limit, Interest Expense (Details) - USD ($)
$ in Thousands
6 Months Ended
Aug. 31, 2017
Aug. 31, 2016
INTEREST EXPENSE    
Deferred finance costs $ 650 $ 583
3.90% unsecured Senior Notes payable | Book value    
Long-term debt    
Long-term debt $ 19,900