Retirement Benefit Plan (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Jan. 01, 2011
Retirement Benefit Plan [Abstract]
Service cost	$ 107	$ 117
Interest cost	216	194
Expected return on plan assets	(171)	(172)
Net amortization and deferral	20	37
Net periodic benefit cost	$ 172	$ 176
Expected rate of return on plan assets (in hundredths)	5.40%	5.20%