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Regulatory Requirements and Subsidiary Dividend Restrictions (Tables) | 12 Months Ended
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Sep. 30, 2019
Capital and Other Regulatory Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] | with a minimum net capital requirement in excess of $5.0 million as well as the actual regulatory capital of the subsidiary as of September 30, 2019 (in millions):
Subsidiary | Regulatory Authority | Actual |  | Minimum Requirement
INTL FCStone Financial Inc. | SEC and CFTC | $ | 170.1 |  |  | $ | 97.5 |
INTL FCStone Ltd | FCA | $ | 231.7 |  |  | $ | 123.3 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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