Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2012
Summary of restructuring accrual activity
Balance at September 30, 2011	$ 980
Cash payments	(774)
Balance at June 30, 2012	206
Employee severance and benefits [Member]
Summary of restructuring accrual activity
Balance at September 30, 2011	730
Cash payments	(720)
Balance at June 30, 2012	10
Facility-related costs [Member]
Summary of restructuring accrual activity
Balance at September 30, 2011	250
Cash payments	(54)
Balance at June 30, 2012	$ 196