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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