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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) - USD ($)
$ in Thousands
May 31, 2019
May 31, 2018
Deferred income tax liabilities    
Indefinite and long-lived assets $ (18,963) $ (17,503)
Prepaid expenses (586) (573)
Deferred Tax Liabilities, Gross (19,549) (18,076)
Deferred income tax assets    
Stock Options 1,497 1,489
Inventories and accounts receivable 1,315 1,593
Tax loss carryforwards 417 134
Valuation allowance on tax loss carryforwards (407)  
Accrued expenses and other 1,109 757
Deferred Tax Assets, Net of Valuation Allowance, Total 3,931 3,973
Net deferred income tax liabilities $ (15,618) $ (14,103)