Assets and Liabilities, at Fair Value - Suriwongse Bonds (Details) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012 USD ($)	Sep. 30, 2012 THB
Assets and Liabilities, at Fair Value [Abstract]
Suriwongse Debt Investment - Original Investment	$ 0	0
Suriwongse Debt Investment - Interest Rate	9.50%	9.50%
Sale of A Portion of the Suriwongse Debt Investment	0	0
Sale of the Suriwongse Debt Investment to Two Investors	0	0
Suriwongse Debt Investment - Maxium Interest Funding with Sale Proceed		0
Ownership % of shares of single asset owning company (Suriwongse)	100.00%	100.00%
Suriwongse Debt Investment Balance	3.6
Loss on Suriwongse Debt Investment	$ (1.7)