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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Aug. 31, 2016
Segment Reporting Information [Line Items]          
Total operating revenues $ 151,533 $ 141,319 $ 386,048 $ 383,514  
Segment operating income 17,414 15,325 28,671 22,379  
Unallocated general and administrative expenses (13,693) (11,882) (35,278) (43,925)  
Earnings before income taxes 16,197 14,065 25,168 18,268  
Capital expenditures 2,025 2,681 6,219 10,073  
Depreciation and amortization 4,217 4,235 12,337 12,771  
Assets 511,287 489,560 511,287 489,560 $ 487,515
Irrigation [Member]          
Segment Reporting Information [Line Items]          
Capital expenditures 1,625 2,108 4,371 7,314  
Depreciation and amortization 3,011 2,981 8,714 8,890  
Assets 343,722 336,376 343,722 336,376 332,294
Infrastructure [Member]          
Segment Reporting Information [Line Items]          
Capital expenditures 131 524 1,235 2,710  
Depreciation and amortization 1,111 1,158 3,330 3,536  
Assets 84,327 79,025 84,327 79,025 81,160
Corporate [Member]          
Segment Reporting Information [Line Items]          
Capital expenditures 269 49 613 49  
Depreciation and amortization 95 96 293 345  
Assets 83,238 74,159 83,238 74,159 $ 74,061
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total operating revenues 151,533 141,319 386,048 383,514  
Segment operating income 24,524 21,214 45,549 49,601  
Operating Segments [Member] | Irrigation [Member]          
Segment Reporting Information [Line Items]          
Total operating revenues 120,040 117,325 316,102 321,733  
Segment operating income 16,508 16,560 32,961 40,333  
Operating Segments [Member] | Infrastructure [Member]          
Segment Reporting Information [Line Items]          
Total operating revenues 31,493 23,994 69,946 61,781  
Segment operating income 8,016 4,654 12,588 9,268  
Segment Reconciling Items [Member]          
Segment Reporting Information [Line Items]          
Unallocated general and administrative expenses (7,110) (5,889) (16,878) (27,222)  
Interest and other expense, net (1,217) (1,260) (3,503) (4,111)  
Earnings before income taxes $ 16,197 $ 14,065 $ 25,168 $ 18,268