Retirement Benefit Plan (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Retirement Benefit Plan [Abstract]
Service cost	$ 101	$ 124	$ 312	$ 359
Interest cost	206	205	633	594
Expected return on plan assets	(163)	(181)	(501)	(526)
Net amortization and deferral	19	39	59	114
Net periodic benefit cost	$ 163	$ 187	$ 503	$ 541
Expected rate of return on plan assets (in hundredths)	5.40%	5.20%	5.40%	5.20%