Acquisitions and Dispositions - Dispositions (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Feb. 28, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business Exit Costs	$ 1,400,000		$ 1,400,000
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds	800,000		800,000
Assets of Disposal Group, Including Discontinued Operation					600,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, before Tax	0	0	100,000	0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	4,100,000	5,900,000	24,300,000	8,800,000
INTL Commodities - Physical Base Metals [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 2,200,000		$ 2,300,000