Acquisitions	9 Months Ended
Jun. 30, 2011
Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	Acquisitions On October 1, 2010, the Company acquired all of the ownership interests in Hencorp Futures, the commodity futures operation of Miami-based Hencorp Becstone. Hencorp Futures specializes in the development and execution of risk-management programs designed to hedge price volatility in a number of widely traded commodities, including coffee, sugar, cocoa, grains and energy products. The transaction will enable the Company to round out its portfolio of commodity risk management services to include a more robust capability in soft commodities, especially coffee, where Hencorp Futures has established a substantial presence and reputation globally, and especially in Central and South America. The acquisition of Hencorp Futures is not significant on an individual basis, and the purchase price consisted of an initial payment of $2.3 million, two payments totaling $1.4 million, representing the adjusted tangible equity of Hencorp Futures as of September 30, 2010, four contingent payments which will be based on Hencorp Futures’ net income for each of the four years after the closing and a final contingent payment based on the average net income of the second, third and fourth years. The present value of the estimated total purchase price, including contingent consideration, at the acquisition date was $6.0 million. The Company has made a preliminary allocation of the purchase costs among tangible assets, identified intangible assets with determinable useful lives, intangible assets with indefinite lives and goodwill. The preliminary intangible assets and goodwill recognized in this transaction were assigned to the C&RM segment. The Company is in the process of finalizing third-party valuations of the intangible assets and contingent liabilities. Purchase costs allocated to intangible assets with determinable useful lives are $1.7 million, which will be amortized over the remaining useful lives of the assets, and include customer relationships of $1.3 million (twenty-year weighted-average useful life) and non-compete agreements of $0.4 million (two-year weighted-average useful life). Purchase costs allocated to intangible assets with indefinite lives are $0.8 million, and relate to a trade name. Goodwill of $2.1 million has been calculated as the excess of the fair value of the consideration transferred over the fair value of the identified net assets acquired and liabilities assumed, and is expected to be deductible for tax purposes. Under the terms of the purchase agreements, the Company has obligations to pay additional consideration if specific conditions and earnings targets are met, as described above. In accordance with the Business Combinations Topic of the ASC, the fair value of the additional consideration is recognized as a contingent liability as of the acquisition date. The acquisition date fair value of additional consideration was estimated to be $2.3 million. The contingent liability for the estimated additional consideration is included in the ‘accounts payable and other accrued liabilities’ caption of the condensed consolidated balance sheet at June 30, 2011. The contingent liability recorded represents the fair value of the expected consideration to be paid based on the forecasted sales during the four year period and a discount rate being applied to those future payments. At the end of each reporting period after the acquisition date, the contingent payment will be remeasured to its fair value, with changes in fair value recorded in current earnings - see Note 13. The Company’s consolidated financial statements include the operating results of Hencorp Futures from the date of acquisition. Effective April 15, 2011, the Company entered into an agreement with Hudson Capital Energy LLC ("HCEnergy"), a New York-based energy risk-management firm, to acquire certain assets from HCEnergy. The transaction enables INTL's energy risk management services to include a more robust capability in crude oil and refined products. HCEnergy is a specialist in exchange cleared options, swaps and futures, and has grown its business to include hedging and trading professionals across the spectrum of global petroleum products. The acquisition of certain assets from HCEnergy is not significant on an individual basis, and the purchase price consideration included the aggregate net asset value of certain commodity futures brokerage accounts and certain proprietary software, totaling $1.0 million. At June 30, 2011, the consideration has not been paid, and is included within 'accounts payable and other liabilities' in the condensed consolidated balance sheets. There was no contingent consideration associated with this transaction, and it is not considered to be material to the consolidated financial statements.

Acquisitions

9 Months Ended

Jun. 30, 2011

Business Combination Disclosure [Text Block]

Acquisitions

On October 1, 2010, the Company acquired all of the ownership interests in Hencorp Futures, the commodity futures operation of Miami-based Hencorp Becstone. Hencorp Futures specializes in the development and execution of risk-management programs designed to hedge price volatility in a number of widely traded commodities, including coffee, sugar, cocoa, grains and energy products. The transaction will enable the Company to round out its portfolio of commodity risk management services to include a more robust capability in soft commodities, especially coffee, where Hencorp Futures has established a substantial presence and reputation globally, and especially in Central and South America.

The acquisition of Hencorp Futures is not significant on an individual basis, and the purchase price consisted of an initial payment of $2.3 million, two payments totaling $1.4 million, representing the adjusted tangible equity of Hencorp Futures as of September 30, 2010, four contingent payments which will be based on Hencorp Futures’ net income for each of the four years after the closing and a final contingent payment based on the average net income of the second, third and fourth years. The present value of the estimated total purchase price, including contingent consideration, at the acquisition date was $6.0 million.

The Company has made a preliminary allocation of the purchase costs among tangible assets, identified intangible assets with determinable useful lives, intangible assets with indefinite lives and goodwill. The preliminary intangible assets and goodwill recognized in this transaction were assigned to the C&RM segment. The Company is in the process of finalizing third-party valuations of the intangible assets and contingent liabilities. Purchase costs allocated to intangible assets with determinable useful lives are $1.7 million, which will be amortized over the remaining useful lives of the assets, and include customer relationships of $1.3 million (twenty-year weighted-average useful life) and non-compete agreements of $0.4 million (two-year weighted-average useful life). Purchase costs allocated to intangible assets with indefinite lives are $0.8 million, and relate to a trade name. Goodwill of $2.1 million has been calculated as the excess of the fair value of the consideration transferred over the fair value of the identified net assets acquired and liabilities assumed, and is expected to be deductible for tax purposes.

Under the terms of the purchase agreements, the Company has obligations to pay additional consideration if specific conditions and earnings targets are met, as described above. In accordance with the Business Combinations Topic of the ASC, the fair value of the additional consideration is recognized as a contingent liability as of the acquisition date. The acquisition date fair value of additional consideration was estimated to be $2.3 million. The contingent liability for the estimated additional consideration is included in the ‘accounts payable and other accrued liabilities’ caption of the condensed consolidated balance sheet at June 30, 2011. The contingent liability recorded represents the fair value of the expected consideration to be paid based on the forecasted sales during the four year period and a discount rate being applied to those future payments. At the end of each reporting period after the acquisition date, the contingent payment will be remeasured to its fair value, with changes in fair value recorded in current earnings - see Note 13. The Company’s consolidated financial statements include the operating results of Hencorp Futures from the date of acquisition.

Effective April 15, 2011, the Company entered into an agreement with Hudson Capital Energy LLC ("HCEnergy"), a New York-based energy risk-management firm, to acquire certain assets from HCEnergy. The transaction enables INTL's energy risk management services to include a more robust capability in crude oil and refined products. HCEnergy is a specialist in exchange cleared options, swaps and futures, and has grown its business to include hedging and trading professionals across the spectrum of global petroleum products.

The acquisition of certain assets from HCEnergy is not significant on an individual basis, and the purchase price consideration included the aggregate net asset value of certain commodity futures brokerage accounts and certain proprietary software, totaling $1.0 million. At June 30, 2011, the consideration has not been paid, and is included within 'accounts payable and other liabilities' in the condensed consolidated balance sheets. There was no contingent consideration associated with this transaction, and it is not considered to be material to the consolidated financial statements.