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Industry Segment Information (Schedule of Segment Reporting Information Impacts on Statement of Operations, by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Nov. 30, 2019 | Nov. 30, 2018
Segment Reporting Information [Line Items] |  |
Total operating revenues | $ 109,393 | $ 111,951
Total operating income | 12,276 | 2,040
Interest and other expense, net | (1,021) | (359)
Earnings before income taxes | 11,255 | 1,681
Capital expenditures | 4,322 | 5,701
Depreciation and amortization | 4,748 | 3,424
Irrigation [Member] |  |
Segment Reporting Information [Line Items] |  |
Total operating revenues | 82,352 | 87,610
Total operating income | 9,757 | 7,783
Capital expenditures | 3,042 | 2,137
Depreciation and amortization | 3,104 | 2,332
Irrigation [Member] | North America [Member] |  |
Segment Reporting Information [Line Items] |  |
Total operating revenues | 52,613 | 56,464
Irrigation [Member] | International [Member] |  |
Segment Reporting Information [Line Items] |  |
Total operating revenues | 29,739 | 31,146
Infrastructure [Member] |  |
Segment Reporting Information [Line Items] |  |
Total operating revenues | 27,041 | 24,341
Total operating income | 8,768 | 4,168
Capital expenditures | 1,112 | 190
Depreciation and amortization | 919 | 965
Corporate Segment |  |
Segment Reporting Information [Line Items] |  |
Total operating income | (6,249) | (9,911)
Capital expenditures | 168 | 3,374
Depreciation and amortization | $ 725 | $ 127

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