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INCOME TAX - Change in Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2016
May 31, 2015
Movement in Deferred Tax Valuation Allowance [Roll Forward]    
Valuation allowance, beginning of period $ (3,823) $ (7,199)
Valuation allowance, end of period (15,119) (3,823)
Utilization of foreign net operating loss carryforwards    
Movement in Deferred Tax Valuation Allowance [Roll Forward]    
Valuation allowance, change (4,474)  
Allowance for domestic net unrealized capital loss    
Movement in Deferred Tax Valuation Allowance [Roll Forward]    
Valuation allowance, change (1,526)  
Allowance for domestic net unrealized capital loss    
Movement in Deferred Tax Valuation Allowance [Roll Forward]    
Valuation allowance, change 1,746  
Other    
Movement in Deferred Tax Valuation Allowance [Roll Forward]    
Valuation allowance, change 98 (11)
Foreign Tax Authority | Allowance for foreign income tax credit carryforward    
Movement in Deferred Tax Valuation Allowance [Roll Forward]    
Valuation allowance, change $ (7,140)  
Foreign Tax Authority | Utilization of foreign net operating loss carryforwards    
Movement in Deferred Tax Valuation Allowance [Roll Forward]    
Valuation allowance, change   $ 3,387