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Commitments And Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 0 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Ward Transformer Site [Member]
respparties
Aug. 07, 2012
TekWorks [Member]
Aug. 05, 2011
TekWorks [Member]
respparties
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Maximum [Member]
Site Contingency [Line Items]            
Site Contingency, Number of Other Potentially Responsible Parties, commenced clean up work   4        
Loss Contingency, Number of Defendants   50   8    
Accrued Insurance $ 5,702          
Reserve for construction defect liabilities 389          
Outstanding letters of credit that were utilized as collateral 8,882          
Estimated cost of completion of bonded project 67,290          
Outstanding amount to collateralize our obligations 1,000          
Outstanding letters of credit was to collateralize vendors 630          
Settlement agreement with regard to collateral held by a surety 2,000          
Loss Contingency, Settlement Agreement, Consideration 2,200          
Right to receive compensation in an event of default 2,450          
Receipt of payments 175          
Risk of loss from collection of debt         0 1,825
Outstanding receivable balance 1,825          
Loss Contingency, Settlement Agreement, Date     2012-08-07      
Loss Contingency Settlement Agreement Consideration 1     1,250      
Accrued Liability Related To Legal Settlements $ 1,230