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LONG-TERM DEBT AND CREDIT FACILITIES - Schedule of effect on other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Derivatives in cash flow hedging relationships:    
Amount of loss recognized in other comprehensive loss $ 3,205 $ 32
Amount of loss recognized in interest expense $ 1,897 $ 1,734