XML 66 R55.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Physical Commodities Inventory - Narrative (Details) bu in Millions, $ in Millions | Dec. 31, 2021 USD ($) bu | Sep. 30, 2021 USD ($)
--- | --- | ---
Inventory [Line Items] |  |
Agricultural related inventory | $ 317.7 | $ 248.6
Soybeans |  |
Inventory [Line Items] |  |
Agricultural related inventory (in bushels) | bu | 2.8 |
Agricultural related inventory | $ 34.7 |

X
- Definition Agricultural Related Inventory, Volume, Amount + References No definition available. + Details
Name: | intl_AgriculturalRelatedInventoryVolumeAmount
Namespace Prefix: | intl_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of merchandise or supplies held which are related to plants and animals. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_AgriculturalRelatedInventory
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_InventoryLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PublicUtilitiesInventoryAxis=intl_SoybeansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |