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Industry Segment Information (Reconciliation Of Assets From Segment To Consolidated) (Details) - USD ($)
$ in Thousands
Nov. 30, 2015
Aug. 31, 2015
Nov. 30, 2014
Segment Reporting Information [Line Items]      
Total Assets $ 521,616 $ 536,468 $ 490,077
Irrigation [Member]      
Segment Reporting Information [Line Items]      
Total Assets 415,106 429,224 368,577
Infrastructure [Member]      
Segment Reporting Information [Line Items]      
Total Assets $ 106,510 $ 107,244 $ 121,500