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Segment Information - Schedule of Assets by Region (Details) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Segment Reporting Information [Line Items]    
Long-Lived Assets $ 374,143 $ 369,753
United States    
Segment Reporting Information [Line Items]    
Long-Lived Assets 284,257 259,457
Foreign countries    
Segment Reporting Information [Line Items]    
Long-Lived Assets $ 89,886 $ 110,296