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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, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Segment Reporting Information [Line Items]        
Total operating revenues $ 169,936 $ 219,542 $ 470,411 $ 542,451
Segment operating income 28,935 44,249 74,308 103,600
Unallocated general and administrative expenses (3,713) (4,699) (12,181) (12,340)
Interest and other income (expense), net 278 200 (21) 361
Earnings before income taxes 25,500 39,750 62,106 91,621
Capital Expenditures 2,483 2,807 7,836 8,149
Depreciation and Amortization 3,747 3,140 11,131 9,380
Irrigation [Member]
        
Segment Reporting Information [Line Items]        
Number of operating segments     13  
Total operating revenues 149,010 200,950 414,077 497,844
Segment operating income 28,040 44,052 72,899 106,787
Capital Expenditures 2,390 2,733 7,327 7,784
Depreciation and Amortization 2,424 1,725 7,123 5,121
Infrastructure [Member]
        
Segment Reporting Information [Line Items]        
Number of operating segments     2  
Total operating revenues 20,926 18,592 56,334 44,607
Segment operating income 895 197 1,409 (3,187)
Capital Expenditures 93 74 509 365
Depreciation and Amortization $ 1,323 $ 1,415 $ 4,008 $ 4,259