Interest Expense, Net (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Interest expense, net
Interest expense	$ 557	$ 1,256	$ 2,266
Interest income	(25)	(41)	(33)
Interest expense, net	$ 532	$ 1,215	$ 2,233