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Industry Segment Information (Reconciliation Of Assets From Segment To Consolidated) (Details) - USD ($)
$ in Thousands
May. 31, 2015
Aug. 31, 2014
May. 31, 2014
Segment Reporting Information [Line Items]      
Assets $ 577,894 $ 526,551 $ 538,571
Irrigation [Member]      
Segment Reporting Information [Line Items]      
Assets 447,988 407,447 404,832
Infrastructure [Member]      
Segment Reporting Information [Line Items]      
Assets $ 129,906 $ 119,104 $ 133,739