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Detail of Certain Balance Sheet Accounts (Tables)
 12 Months Ended
Sep. 30, 2013
Detail Of Certain Balance Sheet Accounts [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Years Ended September 30,
20132012
Balance at beginning of period$ 1,788 $ 2,704 
Additions to costs and expenses 133  771 
Deductions for uncollectible receivables written off, net of recoveries (941) (1,687)
Balance at end of period$ 980 $ 1,788 
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
Years Ended September 30,
20132012
Accounts payable, trade$ 40,659$ 39,879
Accrued compensation and benefits 18,057 13,312
Accrued insurance liabilities 4,963 5,229
Other accrued expenses 10,641 10,253
$ 74,320$ 68,673
Contracts In Progresstable [Text Block]
Years Ended September 30,
20132012
Costs incurred on contracts in progress$ 362,822 $ 402,738 
Estimated earnings 42,464  33,931 
405,286  436,669 
Less--Billings to date (417,626) (453,744)
Net contracts in progress$ (12,340)$ (17,075)
Costs and estimated earnings in excess of billings on uncompleted contracts 8,336  8,180 
Less--Billings in excess of costs and estimated earnings on uncompleted contracts (20,676) (25,255)
Net contracts in progress$ (12,340)$ (17,075)
Schedule of Other Assets, Noncurrent [Table Text Block]
Years Ended September 30,
20132012
Deposits$ 999$ 2,137
Deferred tax assets 1,631 1,065
Executive Savings Plan assets 591 533
Securities and equity investments 919 919
Other 2,576 1,489
Total$ 6,716$ 6,143
Schedule of Cost Method Investments [Table Text Block]
Years Ended September 30,
20132012
Carrying value$ 919$ 919
Unrealized gains 138 69
Fair value$ 1,057$ 988