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Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Disaggregation Of Revenue [Line Items]        
Revenue from the contracts with customers $ 158,348 $ 120,643 $ 403,721 $ 339,511
Lease revenue 3,588 2,463 10,277 6,776
Total operating revenues 161,936 123,106 413,998 346,287
Point in Time [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from the contracts with customers 147,822 107,627 375,020 293,786
Over Time [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from the contracts with customers 10,526 13,016 28,701 45,725
Irrigation [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from the contracts with customers 140,175 95,501 346,104 272,321
Lease revenue 0 0 0 0
Total operating revenues 140,175 95,501 346,104 272,321
Irrigation [Member] | Point in Time [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from the contracts with customers 131,032 84,356 321,960 232,017
Irrigation [Member] | Over Time [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from the contracts with customers 9,143 11,145 24,144 40,304
Infrastructure [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from the contracts with customers 18,173 25,142 57,617 67,190
Lease revenue 3,588 2,463 10,277 6,776
Total operating revenues 21,761 27,605 67,894 73,966
Infrastructure [Member] | Point in Time [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from the contracts with customers 16,790 23,271 53,060 61,769
Infrastructure [Member] | Over Time [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from the contracts with customers $ 1,383 $ 1,871 $ 4,557 $ 5,421