Retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Components of net periodic benefit cost
Service cost	$ 266	$ 273
Interest cost	988	1,059
Expected return on plan assets	(1,413)	(1,454)
Amortization of prior service cost	47	117
Amortization of net loss	861	682
Early retirement expense	0	61
Settlement cost	513	0
Net pension expense for defined benefit plan	$ 1,262	$ 738