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Credit Facilities - Number of Credit Facilities (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) Rate | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2013 USD ($) | Dec. 11, 2019 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Debt, Gross | $ 168,400,000 |  |  |  |
Payments of Debt Issuance Costs | $ 3,300,000 | $ 400,000 | $ 300,000 | $ 1,700,000 |
Number of credit facilities | 4 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 100.0 |  |  |  |
Maximum Borrowing Capacity Under Credit Facilities | $ 743,900,000 |  |  |  |
Term loan periodic principal payment percentage | Rate | 1.30% |  |  |  |
Rabobank Uncommited Line of Credit [Domain] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End | Rate | 5.00% |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 20,000,000.0 |  |  |  |
Rabobank Uncommited Line of Credit [Domain] | Base Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |  |  |  |
INTL FCStone Inc. Bank of America Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Payments of Debt Issuance Costs | $ 3,100,000 |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate | 0.625% |  |  |  |
Maximum Borrowing Capacity Under Credit Facilities | $ 350,000,000 | $ 262,000,000 |  |  |
INTL FCStone, Ltd [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 50,000,000 |  |  |  |
INTL FCStone Financial Margin line of credit facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate | 0.50% |  |  |  |
Line of Credit Facility, Interest Rate at Period End | Rate | 7.25% |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 75,000,000 |  |  |  |
FMS Sub-note commodity line of credit facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate | 0.38% |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 232,500,000 |  |  |  |
Subsequent Event [Member] | INTL FCStone Inc. Bank of America Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 196,500,000
Debt Instrument, Face Amount |  |  |  |  | 196,500,000
Maximum Borrowing Capacity Under Credit Facilities |  |  |  |  | $ 386,400,000
Cost of Funds Rate [Domain] | Rabobank Uncommited Line of Credit [Domain] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.00% |  |  |  |
Base Rate [Member] | INTL FCStone Inc. Bank of America Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |
Line of Credit Facility, Interest Rate at Period End | Rate | 7.25% |  |  |  |
Base Rate [Member] | INTL FCStone, Ltd [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |  |  |  |
Base Rate [Member] | INTL FCStone Financial Margin line of credit facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |
Base Rate [Member] | FMS Sub-note commodity line of credit facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End | Rate | 5.00% |  |  |  |
Eurodollar [Member] | INTL FCStone Inc. Bank of America Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.00% |  |  |
Line of Credit Facility, Interest Rate at Period End | Rate | 4.95% |  |  |  |
Eurodollar [Member] | FMS Sub-note commodity line of credit facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End | Rate | 4.50% |  |  |  |

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