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Industry Segment Information (Reconciliation Of Assets From Segment To Consolidated) (Details) - USD ($)
$ in Thousands
Feb. 29, 2016
Aug. 31, 2015
Feb. 28, 2015
Segment Reporting Information [Line Items]      
Total Assets $ 495,483 $ 536,468 $ 598,780
Irrigation [Member]      
Segment Reporting Information [Line Items]      
Total Assets 386,287 429,224 477,642
Infrastructure [Member]      
Segment Reporting Information [Line Items]      
Total Assets $ 109,196 $ 107,244 $ 121,138