Retirement Benefit Plans - Amounts in Accumulated Other Comprehensive Loss Expected to be Recognized as Components of Net Periodic Benefit Costs (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2016 USD ($)
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Net loss, Plans in which Assets Exceed Benefit Obligations	$ 0
Net loss, Plans in which Benefit Obligations Exceed Assets	$ 887