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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Deferred income tax liabilities    
Indefinite and long-lived assets $ (15,906) $ (13,759)
Prepaid expenses (431) (358)
Deferred Tax Liabilities, Gross (16,337) (14,117)
Deferred income tax assets    
Inventories and accounts receivable 1,809 1,471
Accrued expenses and other 2,808 2,201
Deferred Tax Assets, Net of Valuation Allowance, Total 4,617 3,672
Net deferred income tax liabilities $ (11,720) $ (10,445)