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Credit Facilities (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2013 | Sep. 30, 2015 | May 05, 2015 | Apr. 15, 2015
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150.0 |  |  |  |  |  |
Payables to lenders under loans | 355,200,000 | $ 230,200,000 |  |  |  |  |
Notes Payable to Bank | $ 1,200,000 | 2,000,000 |  |  |  |  | $ 4,000,000
Debt Instrument, Interest Rate, Stated Percentage | 8.50% |  |  |  |  |  |
Debt Instrument, Call Feature, Redemption Price Percentage of Principal | 100.00% |  |  |  |  |  |
Payments of Debt Issuance Costs | $ 400,000 | 300,000 | $ 2,100,000 | $ 1,700,000 |  |  |
Senior Notes |  |  |  |  | $ 45,500,000 |  |
Debt and Capital Lease Obligations | $ 355,200,000 | 230,200,000 |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  | 1,000,000 |  |  |  |  |
Debt, Weighted Average Interest Rate | 2.00% |  |  |  |  |  |
HCO Syndicated line of credit facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End | 5.17% |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 262,000,000 |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.625% |  |  |  |  |  |
Payables to lenders under loans | $ 208,200,000 | 150,000,000 |  |  |  |  |
INTL FCStone Financial Margin line of credit facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End | 7.25% |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 75,000,000 |  |  |  |  | $ 75,000,000 |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.50% |  |  |  |  |  |
Payables to lenders under loans | $ 0 | 0 |  |  |  |  |
INTL FCStone Financial Inc. Uncommitted Commodities Delivery Line [Domain] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Payables to lenders under loans | 0 | 23,000,000 |  |  |  |  |
INTL FCStone Ltd. Uncommitted Line of Credit [Domain] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 20,000,000.0 |  |  |  |  |  |
Payables to lenders under loans | $ 0 | 0 |  |  |  |  |
Rabobank Uncommited Line of Credit [Domain] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End | 5.40% |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 20,000,000.0 |  |  |  |  |  |
Letter of Credit Interest Rate | 2.75% |  |  |  |  |  |
Payables to lenders under loans | $ 3,800,000 | 0 |  |  |  |  |
FMS Sub-note commodity line of credit facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End | 4.77% |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 232,500,000 |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.38% |  |  |  |  |  |
BMO Committed Credit Facility [Member] [Domain] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Payables to lenders under loans | $ 128,000,000 | 44,200,000 |  |  |  |  |
INTL FCStone, Ltd [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 25,000,000 |  |  |  |  |  |
Payables to lenders under loans | $ 0 | 0 |  |  |  |  |
INTL FCStone Financial Inc. Uncommitted Lines of Credit [Domain] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End | 2.88% |  |  |  |  |  |
Payables to lenders under loans | $ 14,000,000 | 34,000,000 |  |  |  |  |
INTL FCStone Financial Inc. Uncommitted Sterne Legacy BNYM Line of Credit [Domain] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Payables to lenders under loans |  | 0 |  |  |  |  |
INTL FCStone Financial Inc. Uncommitted Sterne BMO Line [Domain] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Payables to lenders under loans | 0 | $ 11,000,000 |  |  |  |  |
Main line of credit facilities [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 594,500,000 |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 362,000,000 |  |  |  |  |  |
Base Rate [Member] | HCO Syndicated line of credit facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |  |  |  |  |  |
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] | INTL FCStone Financial Inc. Uncommitted Commodities Delivery Line [Domain] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |  |  |  |  |  |
Base Rate [Member] | Sterne Agee [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |  |  |  |  |  |
Base Rate [Member] | Rabobank Uncommited Line of Credit [Domain] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |  |  |  |  |  |
Base Rate [Member] | INTL FCStone, Ltd [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |  |  |  |  |  |
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% |  |  |  |  |  |

X
- Definition The entity may redeem the debt, in whole or in part, at any time on and after a certain date, at a redemption price equal to a certain percentage of the principal amount redeemed plus accrued and unpaid interest to, but not including, the redemption date. + References No definition available. + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, the carrying value as of the balance sheet date of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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