Commitments and Contingencies	6 Months Ended
Mar. 31, 2012
Commitments and Contingencies [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Commitments and Contingencies Legal Proceedings Certain conditions may exist as of the date that the financial statements are issued, which may result in a loss to the Company but which will only be resolved when one or more future events occur or fail to occur. The Company assesses such contingent liabilities, and such assessment inherently involves an exercise of judgment. In assessing loss contingencies related to legal proceedings that are pending against the Company or unasserted claims that may result in such proceedings, the Company's legal counsel evaluates the perceived merits of any legal proceedings or unasserted claims as well as the perceived merits of the amount of relief sought or expected to be sought therein. If the assessment of a contingency indicates that it is probable that a material loss has been incurred at the date of the financial statements and the amount of the liability can be estimated, then the estimated liability would be accrued in the Company's financial statements. If the assessment indicates that a potentially material loss contingency is not probable, but is reasonably possible, or is probable but cannot be estimated, then the nature of the contingent liability, together with an estimate of the range of possible loss if determinable and material, would be disclosed. Neither accrual nor disclosure is required for loss contingencies that are deemed remote. We accrue legal fees related to contingent liabilities as they are incurred. In addition to the matters discussed below, from time to time and in the ordinary course of business, we are involved in various legal actions and proceedings, including tort claims, contractual disputes, employment matters, workers' compensation claims and collections. We carry insurance that provides protection against certain types of claims, up to the policy limits of our insurance. As of March 31, 2012, the condensed consolidated balance sheet includes loss contingency accruals, recorded in fiscal 2011 and during the six months ended March 31, 2012, which are not material, individually or in the aggregate, to the Company's earnings, financial position or liquidity. In the opinion of management, possible exposure in these matters in excess of the amounts accrued is not material to the Company's earnings, financial position or liquidity. The following is a summary of significant legal matters involving the Company. Securities Litigation FCStone and certain officers of FCStone were named as defendants in an action filed in the United States District Court for the Western District of Missouri on July 15, 2008. A consolidated amended complaint ("CAC") was subsequently filed on September 25, 2009. As alleged in the CAC, the action purports to be brought as a class action on behalf of purchasers of FCStone common stock between November 15, 2007 and February 24, 2009. The CAC seeks to hold defendants liable under Section 10(b) and Section 20(a) of the Securities Exchange Act of 1934 and concerns disclosures included in FCStone's fiscal year 2008 public filings. Specifically, the CAC relates to FCStone's public disclosures regarding an interest rate hedge, a bad debt expense arising from unprecedented events in the cotton trading market, and certain disclosures beginning on November 3, 2008 related to losses it expected to incur arising primarily from a customer energy trading account. FCStone and the named officers moved to dismiss the action. The parties to the litigation reached an agreement in principle to settle this matter subsequent to March 31, 2012. The proposed settlement would be at no cost to the Company after consideration of insurance, and is subject to approval by the court. In August, 2008, a shareholder derivative action was filed against FCStone and certain directors of FCStone in the Circuit Court of Platte County, Missouri, alleging breaches of fiduciary duties, waste of corporate assets and unjust enrichment. An amended complaint was subsequently filed in May, 2009 to add claims based upon the losses sustained by FCStone arising out of a customer's energy trading account. On July 7, 2009, the same plaintiff filed a motion for leave to amend the existing case to add a purported class action claim on behalf of the holders of FCStone common stock. On July 8, 2009, a purported shareholder class action complaint was filed against FCStone and its directors, as well as the Company, in the Circuit Court of Clay County, Missouri. The complaint alleged that FCStone and its directors breached their fiduciary duties by failing to maximize stockholder value in connection with the contemplated acquisition of FCStone by the Company. This complaint was subsequently consolidated with the complaint filed in the Circuit Court of Platte County, Missouri. The plaintiffs subsequently filed an amended consolidated complaint which does not assert any claims against the Company. This complaint purports to be filed derivatively on FCStone and the Company's behalf and against certain of FCStone current and former directors and officers and directly against the same individuals. The Company, FCStone and the defendants filed motions to dismiss on multiple grounds. That motion is fully briefed and pending decision. The staff of the Fort Worth Regional Office of the SEC conducted a formal investigation of FCStone's disclosures and accounting for losses associated with the energy trading account, which occurred prior to the Company's acquisition of FCStone on September 30, 2009. During the quarters ended March 31, 2011 and June 30, 2011, certain employees of the Company testified before the SEC in connection with this investigation. The Company cooperated fully with the SEC staff in its investigation. During the quarter ended March 31, 2012, the Company was informed that the staff of the SEC had closed its investigation of FCStone, and was not taking enforcement action against FCStone or any of its current or former officers. The Company has also received a request from the CFTC for certain information relating to the energy trading account matter. The Company is cooperating fully with the staff of the CFTC, and cannot predict the scope, duration or outcome of the CFTC's review, including monetary penalties or fines, if any. In February 2011, the Company's Board of Directors formed a special committee to conduct an independent investigation of FCStone's disclosures and accounting for losses associated with the energy trading account. The Board of Directors determined that it would be appropriate and consistent with its governance and oversight responsibilities to form the special committee to investigate these matters as they pertain to the private litigation and the SEC investigation described above. The special committee, which is comprised solely of independent directors of the Company who were not formerly directors of FCStone, retained an independent law firm to represent and assist it in its investigation. Convertible Note Holder Litigation In November 2009, an investor in a principal amount of $3.7 million of the Company’s senior subordinated convertible notes due 2011 (the “Notes”) filed a notice of motion for summary judgment on the Company, claiming that the FCStone transaction resulted in a change of control as defined in the Notes; and that, as a result, the Company should have afforded the investor the opportunity to have the Notes redeemed at a 15% premium. The investor also claimed default interest at the rate of 15% per annum established in the Notes. The investor's motion was denied in March, 2010, and the investor filed an amended complaint in April, 2010. The remaining three holders of the Notes, holding Notes in an aggregate amount of $13.0 million, filed a similar lawsuit on the Company on October 20, 2010. During the year ended September 30, 2011, the holders of the Notes converted the principal amount and accrued interest into shares of common stock of the Company. Subsequent to conversion, two holders of the Notes, each a holder of $4.0 million in principal amount of the convertible notes as of September 30, 2009, persisted in their claim against the Company. During the quarter ended March 31, 2012, the Company entered into an agreement with the two holders of the Notes, pursuant to which the Company paid the plaintiffs the amount of $0.2 million in settlement of all claims. Sentinel Litigation In August 2008, the bankruptcy trustee for Sentinel Management Group, Inc. ("Sentinel") filed adversary proceedings against one of the Company's subsidiaries, FCStone, LLC, and a number of other FCMs in the U.S. Bankruptcy Court for the Northern District of Illinois. This case was subsequently reassigned to the United States District Court for the Northern District of Illinois. In the complaint, the trustee is seeking avoidance of alleged transfers or withdrawals of funds received by the Company and other FCMs within 90 days prior to the filing of the Sentinel bankruptcy petition, as well as avoidance of post-petition distributions and disallowance of the proof of claim filed by the FCStone, LLC. The trustee seeks recovery of pre- and post-petition transfers totaling approximately $15.5 million. In April 2009, the trustee filed an amended complaint adding a claim for unjust enrichment. FCStone, LLC answered the complaints and all parties entered into the discovery phase of the litigation. On January 21, 2011 the trustee filed a motion for summary judgment on various counts in the adversary proceedings filed in August, 2008 against FCStone, LLC and a number of other FCMs. The motion has since been fully briefed, and is pending before the court awaiting decision. On January 13, 2012, the Company filed a motion for summary judgment in its favor with respect to the transfer of approximately $1.1 million to its customer segregated account on August 17, 2007 pursuant to the "safe harbor" provisions of Section 546(e) of the U.S. Bankruptcy Code. On April 17, 2012, the Company and all other FCM Defendants filed a motion to dismiss a portion of the claims made by the Trustee in its amended complaint. FCStone, LLC intends to continue to defend the matter vigorously, and to coordinate its defense with the other FCMs. The court has now set a trial date of October 1, 2012 for this matter. Contractual Commitments Contingent Liabilities - Acquisitions Under the terms of the purchase agreements related to the acquisitions listed below, the Company has obligations to pay additional consideration if specific conditions and earnings targets are met. 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 contingent liability for these estimated additional purchase price considerations are included within ‘accounts payable and other accrued liabilities’ in the condensed consolidated balance sheets as of March 31, 2012. The acquisition date fair value of additional consideration is remeasured to its fair value each reporting period, with changes in fair value recorded in current earnings. The Company has a contingent liability relating to the November 2011 acquisition of Coffee Network which may result in the payment of additional purchase price consideration, see Note 14. The Company has a contingent liability relating to the October 2010 acquisition of Hencorp Becstone Futures, L.C., subsequently renamed INTL Hencorp Futures, LLC ("Hencorp Futures"), which may result in the payment of additional purchase price consideration. The contingent liability recorded represents the fair value of the expected consideration to be paid, based on the forecasted adjusted pre-tax net earnings during the second, third and fourth fiscal years following the closing of the acquisition and a discount rate being applied to those future payments. The change in fair value for the three and six months ended March 31, 2012 was a decrease of twenty-five thousand and an increase of $0.1 million, respectively, included within ‘other expense’ in the condensed consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $6.5 million as of March 31, 2012, of which $2.5 million has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheets. The Company has a contingent liability relating to the July 2010 acquisition of the Hanley Companies, which may result in the payment of additional purchase price consideration. The contingent liability recorded represents the fair value of the expected consideration to be paid, based on the contingent payments equal to 15% of the forecasted adjusted earnings before interest and taxes of the soft commodities derivatives business of the acquired Hanley Companies and INTL Hanley, LLC (the “Derivatives Division”) for the two twelve-month periods ending June 30, 2012 and June 30, 2013 and a final contingent payment based on the cumulative Adjusted EBIT of the Derivatives Division for the three year period commencing on July 1, 2010, with a discount rate being applied to those future payments. The change in fair value for the three and six months ended March 31, 2012 was an increase of $0.3 million and $1.4 million, respectively, included within ‘other expense’ in the condensed consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $52.9 million as of March 31, 2012, of which $14.9 million has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheets. The Company has a contingent liability relating to the April 2010 acquisition of the RMI Companies, which may result in the payment of additional consideration. The contingent liability recorded represents the fair value of expected consideration to be paid based on the forecasted sales during the two twelve-month periods ending March 31, 2012 and 2013, and a discount rate being applied to those future payments. The change in fair value for the three and six months ended March 31, 2012 was an increase of $0.1 million and a decrease of $0.1 million, respectively, included within ‘other expense’ in the condensed consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $15.0 million as of March 31, 2012, of which $5.9 million has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheets. The Company has a contingent liability relating to the February 2008 acquisition of Globecot, Inc. by FCStone, LLC. Under the terms of the purchase agreement, the Company has an obligation to pay additional consideration if specific conditions and earnings targets are met in the twelve-month period ending December 31, 2012. Although this transaction was made prior to the Company's acquisition of FCStone, any additional consideration would be considered an adjustment to a pre-acquisition contingency made after the end of the allocation period, and included in earnings in the current period. The additional consideration is limited to $0.4 million for the twelve-month period. Exchange Member Guarantees The Company is a member of various exchanges that trade and clear futures and option contracts. Associated with its memberships, the Company may be required to pay a proportionate share of the financial obligations of another member who may default on its obligations to the exchanges. While the rules governing different exchange memberships vary, in general the Company’s guarantee obligations would arise only if the exchange had previously exhausted its resources. In addition, any such guarantee obligation would be apportioned among the other non-defaulting members of the exchange. Any potential contingent liability under these membership agreements cannot be estimated. The Company has not recorded any contingent liability in the condensed consolidated financial statements for these agreements and believes that any potential requirement to make payments under these agreements is remote.

Commitments and Contingencies

Legal Proceedings

Certain conditions may exist as of the date that the financial statements are issued, which may result in a loss to the Company but which will only be resolved when one or more future events occur or fail to occur. The Company assesses such contingent liabilities, and such assessment inherently involves an exercise of judgment. In assessing loss contingencies related to legal proceedings that are pending against the Company or unasserted claims that may result in such proceedings, the Company's legal counsel evaluates the perceived merits of any legal proceedings or unasserted claims as well as the perceived merits of the amount of relief sought or expected to be sought therein.

If the assessment of a contingency indicates that it is probable that a material loss has been incurred at the date of the financial statements and the amount of the liability can be estimated, then the estimated liability would be accrued in the Company's financial statements. If the assessment indicates that a potentially material loss contingency is not probable, but is reasonably possible, or is probable but cannot be estimated, then the nature of the contingent liability, together with an estimate of the range of possible loss if determinable and material, would be disclosed. Neither accrual nor disclosure is required for loss contingencies that are deemed remote. We accrue legal fees related to contingent liabilities as they are incurred.

In addition to the matters discussed below, from time to time and in the ordinary course of business, we are involved in various legal actions and proceedings, including tort claims, contractual disputes, employment matters, workers' compensation claims and collections. We carry insurance that provides protection against certain types of claims, up to the policy limits of our insurance. As of March 31, 2012, the condensed consolidated balance sheet includes loss contingency accruals, recorded in fiscal 2011 and during the six months ended March 31, 2012, which are not material, individually or in the aggregate, to the Company's earnings, financial position or liquidity. In the opinion of management, possible exposure in these matters in excess of the amounts accrued is not material to the Company's earnings, financial position or liquidity.

The following is a summary of significant legal matters involving the Company.

Securities Litigation

FCStone and certain officers of FCStone were named as defendants in an action filed in the United States District Court for the Western District of Missouri on July 15, 2008. A consolidated amended complaint ("CAC") was subsequently filed on September 25, 2009. As alleged in the CAC, the action purports to be brought as a class action on behalf of purchasers of FCStone common stock between November 15, 2007 and February 24, 2009. The CAC seeks to hold defendants liable under Section 10(b) and Section 20(a) of the Securities Exchange Act of 1934 and concerns disclosures included in FCStone's fiscal year 2008 public filings. Specifically, the CAC relates to FCStone's public disclosures regarding an interest rate hedge, a bad debt expense arising from unprecedented events in the cotton trading market, and certain disclosures beginning on November 3, 2008 related to losses it expected to incur arising primarily from a customer energy trading account. FCStone and the named officers moved to dismiss the action. The parties to the litigation reached an agreement in principle to settle this matter subsequent to March 31, 2012. The proposed settlement would be at no cost to the Company after consideration of insurance, and is subject to approval by the court.

In August, 2008, a shareholder derivative action was filed against FCStone and certain directors of FCStone in the Circuit Court of Platte County, Missouri, alleging breaches of fiduciary duties, waste of corporate assets and unjust enrichment. An amended complaint was subsequently filed in May, 2009 to add claims based upon the losses sustained by FCStone arising out of a customer's energy trading account. On July 7, 2009, the same plaintiff filed a motion for leave to amend the existing case to add a purported class action claim on behalf of the holders of FCStone common stock.

On July 8, 2009, a purported shareholder class action complaint was filed against FCStone and its directors, as well as the Company, in the Circuit Court of Clay County, Missouri. The complaint alleged that FCStone and its directors breached their fiduciary duties by failing to maximize stockholder value in connection with the contemplated acquisition of FCStone by the Company. This complaint was subsequently consolidated with the complaint filed in the Circuit Court of Platte County, Missouri. The plaintiffs subsequently filed an amended consolidated complaint which does not assert any claims against the Company. This complaint purports to be filed derivatively on FCStone and the Company's behalf and against certain of FCStone current and former directors and officers and directly against the same individuals. The Company, FCStone and the defendants filed motions to dismiss on multiple grounds. That motion is fully briefed and pending decision.

The staff of the Fort Worth Regional Office of the SEC conducted a formal investigation of FCStone's disclosures and accounting for losses associated with the energy trading account, which occurred prior to the Company's acquisition of FCStone on September 30, 2009. During the quarters ended March 31, 2011 and June 30, 2011, certain employees of the Company testified before the SEC in connection with this investigation. The Company cooperated fully with the SEC staff in its investigation. During the quarter ended March 31, 2012, the Company was informed that the staff of the SEC had closed its investigation of FCStone, and was not taking enforcement action against FCStone or any of its current or former officers.

The Company has also received a request from the CFTC for certain information relating to the energy trading account matter. The Company is cooperating fully with the staff of the CFTC, and cannot predict the scope, duration or outcome of the CFTC's review, including monetary penalties or fines, if any.

In February 2011, the Company's Board of Directors formed a special committee to conduct an independent investigation of FCStone's disclosures and accounting for losses associated with the energy trading account. The Board of Directors determined that it would be appropriate and consistent with its governance and oversight responsibilities to form the special committee to investigate these matters as they pertain to the private litigation and the SEC investigation described above. The special committee, which is comprised solely of independent directors of the Company who were not formerly directors of FCStone, retained an independent law firm to represent and assist it in its investigation.

Convertible Note Holder Litigation

In November 2009, an investor in a principal amount of $3.7 million of the Company’s senior subordinated convertible notes due 2011 (the “Notes”) filed a notice of motion for summary judgment on the Company, claiming that the FCStone transaction resulted in a change of control as defined in the Notes; and that, as a result, the Company should have afforded the investor the opportunity to have the Notes redeemed at a 15% premium. The investor also claimed default interest at the rate of 15% per annum established in the Notes. The investor's motion was denied in March, 2010, and the investor filed an amended complaint in April, 2010. The remaining three holders of the Notes, holding Notes in an aggregate amount of $13.0 million, filed a similar lawsuit on the Company on October 20, 2010.

During the year ended September 30, 2011, the holders of the Notes converted the principal amount and accrued interest into shares of common stock of the Company. Subsequent to conversion, two holders of the Notes, each a holder of $4.0 million in principal amount of the convertible notes as of September 30, 2009, persisted in their claim against the Company. During the quarter ended March 31, 2012, the Company entered into an agreement with the two holders of the Notes, pursuant to which the Company paid the plaintiffs the amount of $0.2 million in settlement of all claims.

Sentinel Litigation

In August 2008, the bankruptcy trustee for Sentinel Management Group, Inc. ("Sentinel") filed adversary proceedings against one of the Company's subsidiaries, FCStone, LLC, and a number of other FCMs in the U.S. Bankruptcy Court for the Northern District of Illinois. This case was subsequently reassigned to the United States District Court for the Northern District of Illinois. In the complaint, the trustee is seeking avoidance of alleged transfers or withdrawals of funds received by the Company and other FCMs within 90 days prior to the filing of the Sentinel bankruptcy petition, as well as avoidance of post-petition distributions and disallowance of the proof of claim filed by the FCStone, LLC. The trustee seeks recovery of pre- and post-petition transfers totaling approximately $15.5 million. In April 2009, the trustee filed an amended complaint adding a claim for unjust enrichment. FCStone, LLC answered the complaints and all parties entered into the discovery phase of the litigation. On January 21, 2011 the trustee filed a motion for summary judgment on various counts in the adversary proceedings filed in August, 2008 against FCStone, LLC and a number of other FCMs. The motion has since been fully briefed, and is pending before the court awaiting decision. On January 13, 2012, the Company filed a motion for summary judgment in its favor with respect to the transfer of approximately $1.1 million to its customer segregated account on August 17, 2007 pursuant to the "safe harbor" provisions of Section 546(e) of the U.S. Bankruptcy Code. On April 17, 2012, the Company and all other FCM Defendants filed a motion to dismiss a portion of the claims made by the Trustee in its amended complaint. FCStone, LLC intends to continue to defend the matter vigorously, and to coordinate its defense with the other FCMs. The court has now set a trial date of October 1, 2012 for this matter.

Contractual Commitments

Contingent Liabilities - Acquisitions

Under the terms of the purchase agreements related to the acquisitions listed below, the Company has obligations to pay additional consideration if specific conditions and earnings targets are met. 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 contingent liability for these estimated additional purchase price considerations are included within ‘accounts payable and other accrued liabilities’ in the condensed consolidated balance sheets as of March 31, 2012. The acquisition date fair value of additional consideration is remeasured to its fair value each reporting period, with changes in fair value recorded in current earnings.

The Company has a contingent liability relating to the November 2011 acquisition of Coffee Network which may result in the payment of additional purchase price consideration, see Note 14.

The Company has a contingent liability relating to the October 2010 acquisition of Hencorp Becstone Futures, L.C., subsequently renamed INTL Hencorp Futures, LLC ("Hencorp Futures"), which may result in the payment of additional purchase price consideration. The contingent liability recorded represents the fair value of the expected consideration to be paid, based on the forecasted adjusted pre-tax net earnings during the second, third and fourth fiscal years following the closing of the acquisition and a discount rate being applied to those future payments. The change in fair value for the three and six months ended March 31, 2012 was a decrease of twenty-five thousand and an increase of $0.1 million, respectively, included within ‘other expense’ in the condensed consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $6.5 million as of March 31, 2012, of which $2.5 million has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheets.

The Company has a contingent liability relating to the July 2010 acquisition of the Hanley Companies, which may result in the payment of additional purchase price consideration. The contingent liability recorded represents the fair value of the expected consideration to be paid, based on the contingent payments equal to 15% of the forecasted adjusted earnings before interest and taxes of the soft commodities derivatives business of the acquired Hanley Companies and INTL Hanley, LLC (the “Derivatives Division”) for the two twelve-month periods ending June 30, 2012 and June 30, 2013 and a final contingent payment based on the cumulative Adjusted EBIT of the Derivatives Division for the three year period commencing on July 1, 2010, with a discount rate being applied to those future payments. The change in fair value for the three and six months ended March 31, 2012 was an increase of $0.3 million and $1.4 million, respectively, included within ‘other expense’ in the condensed consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $52.9 million as of March 31, 2012, of which $14.9 million has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheets.

The Company has a contingent liability relating to the April 2010 acquisition of the RMI Companies, which may result in the payment of additional consideration. The contingent liability recorded represents the fair value of expected consideration to be paid based on the forecasted sales during the two twelve-month periods ending March 31, 2012 and 2013, and a discount rate being applied to those future payments. The change in fair value for the three and six months ended March 31, 2012 was an increase of $0.1 million and a decrease of $0.1 million, respectively, included within ‘other expense’ in the condensed consolidated income statements. The present value of the estimated total purchase price, including contingent consideration, is $15.0 million as of March 31, 2012, of which $5.9 million has not been paid and is included within ‘accounts payable and other liabilities’ in the condensed consolidated balance sheets.

The Company has a contingent liability relating to the February 2008 acquisition of Globecot, Inc. by FCStone, LLC. Under the terms of the purchase agreement, the Company has an obligation to pay additional consideration if specific conditions and earnings targets are met in the twelve-month period ending December 31, 2012. Although this transaction was made prior to the Company's acquisition of FCStone, any additional consideration would be considered an adjustment to a pre-acquisition contingency made after the end of the allocation period, and included in earnings in the current period. The additional consideration is limited to $0.4 million for the twelve-month period.

Exchange Member Guarantees

The Company is a member of various exchanges that trade and clear futures and option contracts. Associated with its memberships, the Company may be required to pay a proportionate share of the financial obligations of another member who may default on its obligations to the exchanges. While the rules governing different exchange memberships vary, in general the Company’s guarantee obligations would arise only if the exchange had previously exhausted its resources. In addition, any such guarantee obligation would be apportioned among the other non-defaulting members of the exchange. Any potential contingent liability under these membership agreements cannot be estimated. The Company has not recorded any contingent liability in the condensed consolidated financial statements for these agreements and believes that any potential requirement to make payments under these agreements is remote.