Detail of Selected Balance Sheet Accounts (Cost and Estimated Earnings on Uncompleted Contracts) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Detail of Selected Balance Sheet Accounts [Abstract]
Costs incurred on uncompleted contracts	$ 685,257	$ 618,570
Estimated earnings	172,948	159,962
Total	858,205	778,532
Less: Billings to date	(820,707)	(747,446)
Net underbilled position	37,498	31,086
Included in the accompanying balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts – underbilled	79,517	79,420
Billings in excess of costs and estimated earnings on uncompleted contracts – overbilled	(42,019)	(48,334)
Net underbilled position	$ 37,498	$ 31,086