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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2013 | May 31, 2012 | May 31, 2013 | May 31, 2012
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | $ 219,542 | $ 172,099 | $ 542,451 | $ 423,438
Segment operating income | 44,249 | 32,675 | 103,600 | 63,347
Unallocated general and administrative expenses | (4,699) | (3,888) | (12,340) | (10,529)
Interest and other income (expense), net | 200 | (200) | 361 | (363)
Earnings before income taxes | 39,750 | 28,587 | 91,621 | 52,455
Capital Expenditures | 2,807 | 2,850 | 8,149 | 7,573
Depreciation and Amortization | 3,140 | 3,149 | 9,380 | 9,384
Environmental remediation expenses |  |  |  | 7,225
Irrigation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 200,950 | 149,624 | 497,844 | 367,388
Segment operating income | 44,052 | 31,242 | 106,787 | 64,046
Capital Expenditures | 2,733 | 2,662 | 7,784 | 6,493
Depreciation and Amortization | 1,725 | 1,710 | 5,121 | 5,055
Environmental remediation expenses |  |  |  | 6,141
Infrastructure [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 18,592 | 22,475 | 44,607 | 56,050
Segment operating income | 197 | 1,433 | (3,187) | (699)
Capital Expenditures | 74 | 188 | 365 | 1,080
Depreciation and Amortization | 1,415 | 1,439 | 4,259 | 4,329
Environmental remediation expenses |  |  |  | $ 1,084

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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