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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 | 6 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | $ 113,788 | $ 109,182 | $ 223,181 | $ 221,133
Total operating income (loss) | 8,642 | (4,460) | 20,918 | (2,420)
Interest and other expense, net | (1,775) | (608) | (2,796) | (967)
Earnings (loss) before income taxes | 6,867 | (5,068) | 18,122 | (3,387)
Irrigation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 92,073 | 95,766 | 174,425 | 183,376
Total operating income (loss) | 9,614 | 7,521 | 19,371 | 15,304
Irrigation [Member] | North America [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 65,667 | 57,681 | 118,280 | 114,145
Irrigation [Member] | International [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 26,406 | 38,085 | 56,145 | 69,231
Infrastructure [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 21,715 | 13,416 | 48,756 | 37,757
Total operating income (loss) | 6,358 | (446) | 15,126 | 3,722
Corporate Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating income (loss) | $ (7,330) | $ (11,535) | $ (13,579) | $ (21,446)

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