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Significant Components of Deferred Income Tax Liabilities and Assets (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2013
May 31, 2012
Deferred income tax liabilities    
Indefinite and long-lived assets $ (13,953) $ (11,238)
Prepaids (333) (365)
Deferred Tax Liabilities, Gross (14,286) (11,603)
Deferred income tax assets    
Inventories and accounts receivable 1,228 1,149
Acquired net operating loss carry forwards 0 19
Accrued liabilities and other 2,071 1,789
Deferred Tax Assets, Net of Valuation Allowance, Total 3,299 2,957
Net deferred income tax liabilities $ (10,987) $ (8,646)