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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 12 Months Ended
May 31, 2016
Supplemental Cash Flow Information [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures
Supplemental cash flow disclosures for the years ended May 31, 2016, 2015, and 2014 are as follows:
 
2016
  
2015
  
2014
 
(in thousands)
Income taxes paid, net of refunds
$
89,684

 
$
66,726

 
$
94,938

Interest paid
$
58,730

 
$
36,537

 
$
33,214