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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Supplemental Cash Flow Information [Abstract]      
Income taxes paid, net of refunds $ 89,684 $ 66,726 $ 94,938
Interest paid $ 58,730 $ 36,537 $ 33,214