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Long-Term Debt - Interest rates (Details) - Credit Agreement
3 Months Ended 9 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Minimum        
Revolving Line of Credit        
Interest rate range during each year (as a percent) 2.02% 1.44% 1.93% 1.43%
Maximum        
Revolving Line of Credit        
Interest rate range during each year (as a percent) 4.25% 3.75% 4.25% 4.00%