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Industry Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Aug. 31, 2011
Operating income $ 5,083 $ 6,610  
Total operating revenues 119,205 89,166  
Segment operating income (loss) 8,608 [1] 9,926 [1]  
Unallocated general and administrative expenses (3,525) (3,316)  
General and administrative expense 8,940 7,318  
Other expense, net (642) (33)  
Earnings before income taxes 4,441 6,577  
Capital expenditures 2,632 1,484  
Depreciation and amortization 3,125 2,926  
Assets 384,082 325,766 381,144
Environmental Remediation Expense 7,225 713  
Irrigation [Member]
      
Operating revenue 100,776 60,009  
Segment operating income (loss) 9,785 [1] 5,901 [1]  
Capital expenditures 2,036 856  
Depreciation and amortization 1,670 1,352  
Assets 270,395 214,148 267,275
Environmental Remediation Expense 6,100 600  
Infrastructure [Member]
      
Operating revenue 18,429 29,157  
Segment operating income (loss) (1,177) [1] 4,025 [1]  
Capital expenditures 596 628  
Depreciation and amortization 1,455 1,574  
Assets 113,687 111,618 113,869
Environmental Remediation Expense $ 1,100 $ 100  
[1] Environmental remediation expenses of $6.1 and $1.1 million were allocated to the irrigation segment and the infrastructure segment, respectively, for the three months ended November 30, 2011. Environmental remediation expenses of $0.6 and $0.1 million were allocated to the irrigation segment and the infrastructure segment, respectively, for the three months ended November 30, 2010.