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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Aug. 31, 2018
Segment Reporting Information [Line Items]      
Total operating revenues $ 111,951 $ 124,526  
Total operating income 2,040 6,201  
Earnings before income taxes 1,681 4,792  
Capital expenditures 5,701 1,991  
Depreciation and amortization 3,424 4,335  
Total Assets 502,519 503,407 $ 500,256
Irrigation [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 87,610    
Capital expenditures 2,137 1,673  
Depreciation and amortization 2,332 3,079  
Total Assets 289,773 327,183 277,712
Infrastructure [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 24,341    
Capital expenditures 190 196  
Depreciation and amortization 965 1,138  
Total Assets 74,671 76,488 69,919
Corporate Segment      
Segment Reporting Information [Line Items]      
Total operating income (9,911) (4,941)  
Capital expenditures 3,374 122  
Depreciation and amortization 127 118  
Total Assets 138,075 99,736 $ 152,625
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 111,951 124,526  
Operating Segments [Member] | Irrigation [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 87,610 103,353  
Total operating income 7,783 7,851  
Operating Segments [Member] | Irrigation [Member] | North America [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 56,464 67,752  
Operating Segments [Member] | Irrigation [Member] | International      
Segment Reporting Information [Line Items]      
Total operating revenues 31,146 35,601  
Operating Segments [Member] | Infrastructure [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 24,341 21,173  
Total operating income 4,168 3,291  
Segment Reconciling Items [Member]      
Segment Reporting Information [Line Items]      
Interest and other expense, net (359) (1,409)  
Earnings before income taxes $ 1,681 $ 4,792