Assets and Liabilities, at Fair Value Level 4 - Suriwongse Bonds (Details) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2012 THB
Assets and Liabilities, at Fair Value [Abstract]
Suriwongse Debt Investment - Original Investment		$ 18	550
Suriwongse Debt Investment - Interest Rate		9.50%	9.50%
Sale of A Portion of the Suriwongse Debt Investment		12.6	375.5
Sale of the Suriwongse Debt Investment to Two Investors		5.4	174.5
Suriwongse Debt Investment - Maxium Interest Funding with Sale Proceed		1.5	50.0
Ownership % of shares of single asset owning company (Suriwongse)		100.00%	100.00%
Loss on Suriwongse Debt Investment	$ 1.7