Retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Components of net periodic benefit cost
Service cost	$ 126	$ 288
Interest cost	987	851
Curtailment cost	0	229
United States Pension Plan of US Entity [Member]
Components of net periodic benefit cost
Service cost	126	288	266
Interest cost	987	851	988
Expected return on plan assets	(1,573)	(1,485)	(1,413)
Amortization of prior service cost	0	8	47
Amortization of net loss	450	917	861
Settlement cost	0	299	513
Curtailment cost	0	252	0
Net pension (benefit) expense for defined benefit plan	$ (10)	$ 1,130	$ 1,262