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SEGMENT INFORMATION - Schedule of Assets by Region (Details) - USD ($)
$ in Thousands
May 31, 2016
May 31, 2015
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets $ 493,678 $ 374,143
United States    
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets 394,716 284,257
Foreign countries    
Segment Reporting Information [Line Items]    
Long-lived assets, excluding goodwill and other intangible assets $ 98,962 $ 89,886