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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. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | $ 109,182 | $ 130,339 | $ 221,133 | $ 254,865
Total operating income (loss) | (4,460) | 7,291 | (2,420) | 13,492
Interest and other expense, net | (608) | (1,615) | (967) | (3,024)
Earnings (loss) before income taxes | (5,068) | 5,676 | (3,387) | 10,468
Capital expenditures | 6,000 | 2,724 | 11,701 | 4,715
Depreciation and amortization | 3,465 | 4,264 | 6,889 | 8,599
Irrigation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 95,766 | 111,865 | 183,376 | 215,218
Total operating income (loss) | 7,521 | 11,933 | 15,304 | 19,784
Capital expenditures | 2,341 | 2,362 | 4,478 | 4,035
Depreciation and amortization | 2,366 | 2,994 | 4,698 | 6,073
Irrigation [Member] | North America [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 57,681 | 78,863 | 114,145 | 146,616
Irrigation [Member] | International [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 38,085 | 33,002 | 69,231 | 68,602
Infrastructure [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 13,416 | 18,474 | 37,757 | 39,647
Total operating income (loss) | (446) | 2,519 | 3,722 | 5,810
Capital expenditures | 176 | 268 | 366 | 464
Depreciation and amortization | 919 | 1,144 | 1,884 | 2,282
Corporate Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating income (loss) | (11,535) | (7,161) | (21,446) | (12,102)
Capital expenditures | 3,483 | 94 | 6,857 | 216
Depreciation and amortization | $ 180 | $ 126 | $ 307 | $ 244

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