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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Deferred income tax liabilities    
Indefinite and long-lived assets $ (13,759) $ (13,953)
Prepaids (358) (333)
Deferred Tax Liabilities, Gross (14,117) (14,286)
Deferred income tax assets    
Inventories and accounts receivable 1,471 1,228
Accrued liabilities and other 2,201 2,071
Deferred Tax Assets, Net of Valuation Allowance, Total 3,672 3,299
Net deferred income tax liabilities $ (10,445) $ (10,987)