Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Summary of restructuring accrual activity
Beginning Balance	$ 980	$ 1,183	$ 955
Accruals during the year		1,616	1,204
Cash payments	(788)	(1,819)	(976)
Ending Balance	192	980	1,183
Employee severance and benefits [Member]
Summary of restructuring accrual activity
Beginning Balance	730	4
Accruals during the year		1,616	764
Cash payments	(720)	(890)	(760)
Ending Balance	10	730	4
Facility-related costs [Member]
Summary of restructuring accrual activity
Beginning Balance	250	1,179	955
Accruals during the year			440
Cash payments	(68)	(929)	(216)
Ending Balance	$ 182	$ 250	$ 1,179