Restructuring Charges - Restructuring Accrual Activities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 192	$ 980	$ 1,183
Accrual/(reversal) during the year	476		1,616
Cash payments	(252)	(788)	(1,819)
Ending Balance	416	192	980
Employee Severance and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	10	730	4
Accrual/(reversal) during the year	534		1,616
Cash payments	(145)	(720)	(890)
Ending Balance	399	10	730
Facility-Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	182	250	1,179
Accrual/(reversal) during the year	(58)
Cash payments	(107)	(68)	(929)
Ending Balance	$ 17	$ 182	$ 250