Schedule of Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Allowance for doubtful accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 40	$ 32	$ 25
Additions Charged (Credited) to Expenses	(11)	13	79
Deductions From Reserves	3	5	72
Balance at End of Period	26	40	32
Restructuring accrual [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	192	980	1,183
Additions Charged (Credited) to Expenses	476		1,616
Deductions From Reserves	252	788	1,819
Balance at End of Period	$ 416	$ 192	$ 980