Costs and Estimated Earnings in Excess of Billings - Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts (Detail) (USD $)	Dec. 31, 2013	Sep. 30, 2013
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]
Costs incurred on uncompleted contracts	$ 5,763,000
Estimated earnings	1,793,000
Costs and estimated earnings on uncompleted contracts	7,556,000
Billings to date	5,230,000
Costs and estimated earnings in excess of billings	$ 2,326,000	$ 0