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LONG-TERM DEBT AND CREDIT FACILITIES - Schedule of effect on other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2016
May 31, 2015
Debt Disclosure [Abstract]    
Amount of loss recognized in other comprehensive loss $ 12,859 $ 10,116
Amount of loss recognized in interest expense $ 8,240 $ 3,958