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Industry Segment Information (Schedule Of Segment Reporting Information By Segment) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
Feb. 28, 2015
USD ($)
Nov. 30, 2014
USD ($)
Feb. 29, 2016
USD ($)
segment
Feb. 28, 2015
USD ($)
Aug. 31, 2012
USD ($)
Segment Reporting Information [Line Items]            
Number of reportable segments | segment       2    
Total operating revenues $ 120,573 $ 141,089   $ 242,195 $ 275,934  
Segment operating income (4,694) 14,536   7,054 26,438  
Unallocated general and administrative expenses (23,028) (11,680)   (32,043) (24,551)  
Earnings (loss) before income taxes (6,193) 14,138   4,203 25,799  
Capital expenditures 2,687 2,927   7,392 6,576  
Depreciation and amortization 4,241 4,269   8,536 8,017  
Environmental remediation expenses 13,000   $ 1,500 13,000   $ 7,200
Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Segment operating income 12,613 19,216   28,387 37,629  
Segment Reconciling Items [Member]            
Segment Reporting Information [Line Items]            
Unallocated general and administrative expenses [1] (17,307) (4,680)   (21,333) (11,191)  
Interest and other expense, net $ (1,499) $ (398)   $ (2,851) $ (639)  
Total Revenue [Member]            
Segment Reporting Information [Line Items]            
Concentration risk, percentage 0.00% 0.00%   0.00% 0.00%  
Irrigation [Member]            
Segment Reporting Information [Line Items]            
Number of operating segments | segment       5    
Total operating revenues $ 103,081 $ 108,331   $ 204,407 $ 223,047  
Segment operating income 11,081 11,942   23,773 27,911  
Capital expenditures 2,054 2,381   5,206 5,465  
Depreciation and amortization 3,064 3,039   $ 6,158 5,525  
Infrastructure [Member]            
Segment Reporting Information [Line Items]            
Number of operating segments | segment       1    
Total operating revenues 17,492 32,758   $ 37,788 52,887  
Segment operating income 1,532 7,274   4,614 9,718  
Capital expenditures 633 546   2,186 1,111  
Depreciation and amortization $ 1,177 $ 1,230   $ 2,378 2,492  
Environmental remediation expenses         $ 1,500  
[1] Includes environmental remediation expenses of $13.0 million for the three and six month period ended February 29, 2016 and environmental remediation expenses of $1.5 million for the six months ended February 28, 2015.