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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) - USD ($)
$ in Thousands
May 31, 2016
May 31, 2015
Deferred income tax liabilities    
Indefinite and long-lived assets $ (19,296) $ (15,906)
Prepaid expenses (824) (431)
Brazil valuation allowance (542) (542)
Deferred Tax Liabilities, Gross (20,662) (16,879)
Deferred income tax assets    
Stock options 2,786 2,234
Inventories and accounts receivable 2,076 1,809
Tax loss carryforwards 813 542
Accrued expenses and other 229 574
Deferred Tax Assets, Net of Valuation Allowance, Total 5,904 5,159
Net deferred income tax liabilities $ (14,758) $ (11,720)