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Deferred Tax Assets and Liabilities Classified in Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred income taxes, current assets $ 24,272 $ 21,928
Other assets, noncurrent assets 4 276
Deferred income taxes, noncurrent liabilities (71,333) (89,401)
Net deferred tax liabilities $ (47,057) $ (67,197)