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Regulatory Requirements and Subsidiary Dividend Restrictions (Tables) | 12 Months Ended
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Sep. 30, 2016
Capital and Other Regulatory Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] | All subsidiaries of the Company are in compliance with all of their regulatory requirements as of September 30, 2017, as follows:
(in millions) |  |  |  |  | As of September 30, 2017
Subsidiary | Regulatory Authority |  | Requirement Type |  | Actual |  | Minimum Requirement
INTL FCStone Financial Inc. | SEC and CFTC |  | Net capital |  | $ | 157.1 |  |  | $ | 74.0 |
INTL FCStone Financial Inc. | CFTC |  | Segregated funds |  | $ | 2,248.0 |  |  | $ | 2,195.7 |
INTL FCStone Financial Inc. | CFTC |  | Secured funds |  | $ | 165.1 |  |  | $ | 148.7 |
INTL FCStone Financial Inc. | SEC |  | Customer reserve |  | $ | 7.2 |  |  | $ | — |
INTL FCStone Financial Inc. | SEC |  | PAB reserve |  | $ | 13.5 |  |  | $ | 0.2 |
INTL Custody & Clearing Solutions Inc. | SEC |  | Net capital |  | $ | 1.5 |  |  | $ | 0.1 |
SA Stone Wealth Management Inc. | SEC |  | Net capital |  | $ | 4.9 |  |  | $ | 0.3 |
INTL FCStone Ltd | FCA (United Kingdom) |  | Net capital |  | $ | 158.7 |  |  | $ | 88.3 |
INTL FCStone Ltd | FCA (United Kingdom) |  | Segregated funds |  | $ | 107.1 |  |  | $ | 106.6 |
INTL Netherlands BV | FCA (United Kingdom) |  | Net capital |  | $ | 158.0 |  |  | $ | 88.3 |
INTL FCStone DTVM Ltda. | Brazilian Central Bank and Securities and Exchange Commission of Brazil |  | Capital adequacy |  | $ | 13.0 |  |  | $ | 0.5 |
INTL Gainvest S.A. | National Securities Commission ("CNV") |  | Capital adequacy |  | $ | 5.1 |  |  | $ | 0.2 |
INTL Gainvest S.A. | CNV |  | Net capital |  | $ | 0.4 |  |  | $ | 0.1 |
INTL CIBSA S.A. | CNV |  | Capital adequacy |  | $ | 7.6 |  |  | $ | 0.9 |
INTL CIBSA S.A. | CNV |  | Net capital |  | $ | 1.4 |  |  | $ | 0.5 |
Schedule of Regulatory Assets [Table Text Block] | .

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- Definition Capital and Other Regulatory Requirements [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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