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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
May. 31, 2015
USD ($)
May. 31, 2014
USD ($)
May. 31, 2015
USD ($)
segment
May. 31, 2014
USD ($)
Aug. 31, 2012
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segment     2    
Total operating revenues $ 160,707 $ 169,936 $ 436,641 $ 470,411  
Segment operating income 26,358 28,935 62,487 74,308  
Unallocated general and administrative expenses (4,870) (3,713) (14,561) (12,181)  
Interest and other expense, net (1,065) 278 (1,704) (21)  
Earnings before income taxes 20,423 25,500 46,222 62,106  
Capital Expenditures 4,652 2,483 11,228 7,836  
Depreciation and Amortization 4,131 3,747 $ 12,148 11,131  
Environmental remediation expenses 0 0   0 $ 7,200
Irrigation [Member]          
Segment Reporting Information [Line Items]          
Number of operating segments | segment     4    
Total operating revenues 131,289 149,010 $ 354,336 414,077  
Segment operating income 19,860 28,040 46,471 72,899  
Capital Expenditures 4,102 2,390 9,567 7,327  
Depreciation and Amortization 2,925 2,424 8,450 7,123  
Environmental remediation expenses     $ 1,300    
Infrastructure [Member]          
Segment Reporting Information [Line Items]          
Number of operating segments | segment     1    
Total operating revenues 29,418 20,926 $ 82,305 56,334  
Segment operating income 6,498 895 16,016 1,409  
Capital Expenditures 550 93 1,661 509  
Depreciation and Amortization $ 1,206 $ 1,323 3,698 $ 4,008  
Environmental remediation expenses     $ 200