Retirement Benefit Plans (Details 4)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Developing the benefit obligation and the net pension expense for defined benefit pension plans
Discount rate for liabilities	3.60%	4.20%
Discount rate for expenses	4.20%	5.00%
Expected return on assets	8.10%	8.30%