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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) - USD ($)
$ in Thousands
May 31, 2020
May 31, 2019
Deferred income tax liabilities    
Indefinite and long-lived assets $ (20,867) $ (18,963)
Prepaid expenses (795) (586)
Deferred Tax Liabilities, Gross (21,662) (19,549)
Deferred income tax assets    
Stock options 1,479 1,497
Inventories and accounts receivable 1,336 1,315
Tax loss carryforwards 484 417
Less: Valuation allowance (419) (407)
Accrued expenses and other 657 1,109
Deferred Tax Assets, Net of Valuation Allowance, Total 3,537 3,931
Net deferred income tax liabilities $ (18,125) $ (15,618)