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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, 2018
May 31, 2017
May 31, 2018
May 31, 2017
Aug. 31, 2017
Segment Reporting Information [Line Items]          
Total operating revenues $ 169,571 $ 151,533 $ 424,436 $ 386,048  
Total operating income 18,702 17,414 31,969 28,671  
Earnings before income taxes 17,445 16,197 27,913 25,168  
Capital expenditures 2,205 2,025 6,920 6,219  
Depreciation and amortization 4,252 4,217 12,851 12,337  
Total Assets 520,228 511,287 520,228 511,287 $ 506,032
Irrigation [Member]          
Segment Reporting Information [Line Items]          
Capital expenditures 1,950 1,625 5,985 4,371  
Depreciation and amortization 2,974 3,011 9,047 8,714  
Total Assets 326,058 343,722 326,058 343,722 337,446
Infrastructure [Member]          
Segment Reporting Information [Line Items]          
Capital expenditures 252 131 716 1,235  
Depreciation and amortization 1,153 1,111 3,435 3,330  
Total Assets 88,616 84,327 88,616 84,327 80,187
Corporate Segment          
Segment Reporting Information [Line Items]          
Total operating income (7,264) (7,110) (19,591) (16,878)  
Capital expenditures 3 269 219 613  
Depreciation and amortization 125 95 369 293  
Total Assets 105,554 83,238 105,554 83,238 $ 88,399
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total operating revenues 169,571 151,533 424,436 386,048  
Operating Segments [Member] | Irrigation [Member]          
Segment Reporting Information [Line Items]          
Total operating revenues 128,421 120,040 343,639 316,102  
Total operating income 11,718 16,508 31,502 32,961  
Operating Segments [Member] | Infrastructure [Member]          
Segment Reporting Information [Line Items]          
Total operating revenues 41,150 31,493 80,797 69,946  
Total operating income 14,248 8,016 20,058 12,588  
Segment Reconciling Items [Member]          
Segment Reporting Information [Line Items]          
Interest and other expense, net (1,257) (1,217) (4,056) (3,503)  
Earnings before income taxes $ 17,445 $ 16,197 $ 27,913 $ 25,168