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LONG-TERM DEBT - Interest rates (Details) - Credit Agreement
$ in Thousands
 12 Months Ended
Feb. 29, 2016
USD ($)
item
Feb. 28, 2015
USD ($)
Feb. 28, 2014
USD ($)
Revolving Line of Credit      
Average borrowings outstanding | $ $ 399,800 $ 300,280 $ 29,680
Average interest rates during each year (as a percent) 1.60% 2.50% 1.30%
Weighted average interest rates on borrowings outstanding at year end (as a percent) 2.80% 1.90% 0.00%
Number of prior quarters used in calculation of average borrowings outstanding | item 4    
Minimum      
Revolving Line of Credit      
Interest rate range during each year (as a percent) 1.40% 1.90% 1.20%
Maximum      
Revolving Line of Credit      
Interest rate range during each year (as a percent) 4.00% 4.40% 3.60%