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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 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Derivatives in cash flow hedging relationships:        
Amount of loss recognized in other comprehensive income $ 11,946 $ 1,859 $ 15,946 $ 6,278
Amount of loss recognized in interest expense $ 2,083 $ 1,750 $ 6,284 $ 2,281