Assets and Liabilities, at Fair Value - Suriwongse Bonds (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2013
Assets and Liabilities, at Fair Value [Abstract]
Suriwongse Debt Investment Balance		$ 3.5
Loss on Suriwongse Debt Investment	$ (1.7)