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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Aug. 31, 2017
Segment Reporting Information [Line Items]      
Total operating revenues $ 124,526 $ 110,390  
Segment operating income 6,201 2,735  
Unallocated general and administrative expenses (11,918) (11,355)  
Earnings before income taxes 4,792 1,335  
Capital expenditures 1,991 1,390  
Depreciation and amortization 4,335 4,035  
Total Assets 503,407 480,943 $ 506,032
Irrigation [Member]      
Segment Reporting Information [Line Items]      
Capital expenditures 1,673 950  
Depreciation and amortization 3,079 2,823  
Total Assets 327,183 340,711 337,446
Infrastructure [Member]      
Segment Reporting Information [Line Items]      
Capital expenditures 196 440  
Depreciation and amortization 1,138 1,109  
Total Assets 76,488 80,002 80,187
Corporate [Member]      
Segment Reporting Information [Line Items]      
Capital expenditures 122    
Depreciation and amortization 118 103  
Total Assets 99,736 60,230 $ 88,399
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 124,526 110,390  
Segment operating income 11,142 8,124  
Operating Segments [Member] | Irrigation [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 103,353 89,852  
Segment operating income 7,851 5,150  
Operating Segments [Member] | Infrastructure [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 21,173 20,538  
Segment operating income 3,291 2,974  
Segment Reconciling Items [Member]      
Segment Reporting Information [Line Items]      
Unallocated general and administrative expenses (4,941) (5,389)  
Interest and other expense, net (1,409) (1,400)  
Earnings before income taxes $ 4,792 $ 1,335