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Industry Segment Information (Reconciliation Of Assets From Segment To Consolidated) (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2013
Aug. 31, 2012
May 31, 2012
Segment Reporting Information [Line Items]      
Assets $ 518,121 $ 415,531 $ 416,948
Irrigation [Member]
     
Segment Reporting Information [Line Items]      
Assets 398,751 303,741 304,515
Infrastructure [Member]
     
Segment Reporting Information [Line Items]      
Assets $ 119,370 $ 111,790 $ 112,433