Retirement Benefit Plan (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Retirement Benefit Plan [Abstract]
Service cost	$ 174	$ 104	$ 344	$ 211
Interest cost	194	211	384	427
Expected return on plan assets	(175)	(167)	(345)	(338)
Net amortization and deferral	132	20	260	40
Net periodic benefit cost	$ 325	$ 168	$ 643	$ 340
Expected rate of return on plan assets	5.20%			5.40%