Assets and Liabilities, at Fair Value - Available for Sale Securities in OCI (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011
Assets and Liabilities, at Fair Value [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (90,000)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	53,000
Equity Investments in Exchange Stock - Cost	4,400,000	4,400,000
Equity Investments in Exchange Stock - Fair Value	12,400,000	3,700,000
Equity Investments in Exchange Stock - LME Shares Fair Value	8,700,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax - LME Shares	(6,300,000)
Deferred Tax Liabilities, Accumulated Other Comprehensive Income - LME Shares	2,000,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax - Other Exchange Shares	300,000	400,000
Deferred Tax Assets, Accumulated Other Comprehensive Income - Other Exchange Shares	$ (100,000)	$ (300,000)