Postretirement Obligations - Changes in the benefit obligation under Supplemental Executive Retirement Agreements (Detail) (USD $)	12 Months Ended			42 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012
Changes in the benefit obligation under Supplemental Executive Retirement Agreement
Interest cost		$ 18,000	$ 88,000
SERP Agreements
Changes in the benefit obligation under Supplemental Executive Retirement Agreement
Benefit obligation at beginning of year	150,000	732,000
Interest cost		18,000
Benefit payments	(150,000)	(600,000)	(4,166,000)	(3,960,000)
Benefit obligation at end of year		150,000	732,000	150,000
Less: current portion included in accrued expenses and other current liabilities		(150,000)		(150,000)
Non-current benefit obligation at end of year