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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | $ 132,897 | $ 141,319 | $ 120,573 | $ 121,622 | $ 123,540 | $ 160,707 | $ 141,089 | $ 134,845 | $ 516,411 | $ 560,181 | $ 617,933
Operating Income (Loss) |  |  |  |  |  |  |  |  | 34,375 | 50,695 | 78,358
Unallocated general and administrative expenses |  |  |  |  |  |  |  |  | (56,419) | (52,261) | (43,228)
Interest and other income (expense), net |  |  |  |  |  |  |  |  | (5,087) | (3,944) | 297
Earnings before income taxes | 11,020 | $ 14,065 | $ (6,193) | $ 10,396 | 529 | $ 20,423 | $ 14,138 | $ 11,661 | 29,288 | 46,751 | 78,655
Capital expenditures |  |  |  |  |  |  |  |  | 11,496 | 15,244 | 17,715
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,881 | 16,412 | 14,793
Assets | 499,565 |  |  |  | 536,468 |  |  |  | 499,565 | 536,468 | 526,551
Irrigation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 421,641 | 451,205 | 539,943
Capital expenditures |  |  |  |  |  |  |  |  | 8,375 | 12,406 | 14,778
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,774 | 11,000 | 9,125
Assets | 341,972 |  |  |  | 328,036 |  |  |  | 341,972 | 328,036 | 280,031
Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 94,770 | 108,976 | 77,990
Capital expenditures |  |  |  |  |  |  |  |  | 2,977 | 2,671 | 2,181
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,648 | 4,966 | 5,299
Assets | 83,531 |  |  |  | 81,494 |  |  |  | 83,531 | 81,494 | 96,488
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 144 | 167 | 756
Depreciation and amortization |  |  |  |  |  |  |  |  | 459 | 446 | 369
Assets | $ 74,061 |  |  |  | $ 126,938 |  |  |  | 74,061 | 126,938 | 150,033
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 67,767 | 72,314 | 95,208
Operating Segments [Member] | Irrigation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 49,232 | 52,065 | 91,697
Operating Segments [Member] | Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 18,535 | 20,249 | 3,511
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unallocated general and administrative expenses |  |  |  |  |  |  |  |  | $ (33,392) | $ (21,619) | $ (16,850)

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