Retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Components of net periodic benefit cost
Service cost	$ 71	$ 68	$ 214	$ 204
Interest cost	247	265	740	795
Expected return on plan assets	(351)	(364)	(1,052)	(1,092)
Amortization of prior service cost	12	29	35	87
Amortization of net loss	210	171	630	513
Net periodic benefit cost	$ 189	$ 169	$ 567	$ 507