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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, 2015 | May. 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | May. 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | $ 123,540 | [1] | $ 160,707 | $ 141,089 | $ 134,845 | $ 147,522 | [1] | $ 169,936 | $ 152,804 | $ 147,671 | $ 560,181 | $ 617,933 | $ 690,848
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 50,695 | 78,358 | 107,061
Unallocated general and administrative expenses |  |  |  |  |  |  |  |  |  |  | (52,261) | (43,228) | (43,441)
Interest and other income (expense), net |  |  |  |  |  |  |  |  |  |  | (3,944) | 297 | 246
Total | 529 | [1] | $ 20,423 | $ 14,138 | $ 11,661 | 16,549 | [1] | $ 25,500 | $ 20,789 | $ 15,817 | 46,751 | 78,655 | 107,307
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 15,244 | 17,715 | 11,136
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 16,412 | 14,793 | 12,600
Assets | 536,468 |  |  |  |  | 526,551 |  |  |  |  | 536,468 | 526,551 | 512,296
Irrigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | 451,205 | 539,943 | 625,996
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 12,573 | 15,534 | 10,687
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 11,446 | 9,494 | 7,147
Assets | 429,224 |  |  |  |  | 407,447 |  |  |  |  | 429,224 | 407,447 | 391,527
Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | 108,976 | 77,990 | 64,852
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 2,671 | 2,181 | 449
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 4,966 | 5,299 | 5,453
Assets | $ 107,244 |  |  |  |  | $ 119,104 |  |  |  |  | 107,244 | 119,104 | 120,769
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 70,814 | 95,208 | 124,584
Operating Segments [Member] | Irrigation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 50,765 | 91,697 | 125,395
Operating Segments [Member] | Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 20,049 | 3,511 | (811)
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unallocated general and administrative expenses |  |  |  |  |  |  |  |  |  |  | $ (20,119) | $ (16,850) | $ (17,523)
[1] | The fourth quarter 2015 results were impacted by a bad debt reserve of $5.0 million on accounts receivable and a reserve of $2.9 million against foreign income tax assets.

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