Uncompleted Contracts - Gross and Net Amounts of Uncompleted Contracts (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013
Disclosure Customer Contracts Additional Information [Abstract]
Costs incurred and estimated earnings recognized on uncompleted contracts	$ 848,334	$ 802,588
Billings on uncompleted contracts	857,439	791,663
Total	(9,105)	10,925
Shown on balance sheet as:
Costs and estimated earnings in excess of billings on uncompleted contracts	66,678	73,773
Billings on uncompleted contracts in excess of costs and estimated earnings	75,783	62,848
Total	$ (9,105)	$ 10,925