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Industry Segment Information (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Aug. 31, 2022
Segment Reporting Information [Line Items]      
Total operating revenues $ 607,074 $ 674,084 $ 770,743
Total operating income 76,608 102,184 94,643
Total other income (expense) 2,442 (1,809) (6,775)
Earnings before income taxes 79,050 100,375 87,868
Capital expenditures 28,979 18,775 15,595
Capital expenditures 28,979 18,775 15,595
Depreciation and amortization 21,200 19,282 20,178
Irrigation [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 513,896 586,031 665,829
Total operating income 87,547 121,969 105,763
Capital expenditures 24,720 13,043 10,679
Depreciation and amortization 14,480 12,834 13,011
Irrigation [Member] | North America [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 302,148 309,538 355,683
Irrigation [Member] | International [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 211,748 276,493 310,146
Infrastructure [Member]      
Segment Reporting Information [Line Items]      
Total operating revenues 93,178 88,053 104,914
Total operating income 18,995 12,067 18,328
Capital expenditures 4,207 5,287 3,798
Depreciation and amortization 4,396 4,023 3,781
Corporate Segment      
Segment Reporting Information [Line Items]      
Total operating income (29,934) (31,852) (29,448)
Capital expenditures 52 445 1,118
Depreciation and amortization $ 2,324 $ 2,425 $ 3,386