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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) - USD ($)
$ in Thousands
May 31, 2018
May 31, 2017
Deferred income tax liabilities    
Indefinite and long-lived assets $ (17,503) $ (23,177)
Prepaid expenses (573) (640)
Deferred Tax Liabilities, Gross (18,076) (23,817)
Deferred income tax assets    
Stock Options 1,489 2,604
Inventories and accounts receivable 1,593 2,603
Tax loss carryforwards 134 436
Accrued expenses and other 757 1,126
Deferred Tax Assets, Net of Valuation Allowance, Total 3,973 6,769
Net deferred income tax liabilities $ (14,103) $ (17,048)