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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) - USD ($)
$ in Thousands
May 31, 2017
May 31, 2016
Deferred income tax liabilities    
Indefinite and long-lived assets $ (23,177) $ (19,296)
Prepaid expenses (640) (824)
Brazil valuation allowance   (542)
Deferred Tax Liabilities, Gross (23,817) (20,662)
Deferred income tax assets    
Stock Options 2,604 2,786
Inventories and accounts receivable 2,603 2,076
Tax loss carryforwards 436 813
Accrued expenses and other 1,126 229
Deferred Tax Assets, Net of Valuation Allowance, Total 6,769 5,904
Net deferred income tax liabilities $ (17,048) $ (14,758)