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Assets Held for Sale - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
acre
May 31, 2014
Long Lived Assets Held-for-sale [Line Items]    
Land held for sale $ 5,207us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent $ 5,207us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
Purchase land planned to construct future facilities in area 50us-gaap_AreaOfLand