XML 24 R12.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Receivables From Customers, Net and Notes Receivable, Net (Notes) | 3 Months Ended
--- | ---
Dec. 31, 2017
Receivables from customers and notes receivable, net [Abstract] |
Financing Receivables [Text Block] | Allowance for Doubtful Accounts The allowance for doubtful accounts related to receivables from customers was $7.6 million as of December 31, 2017 and September 30, 2017. The allowance for doubtful accounts related to deposits with and receivables from broker-dealers, clearing organizations, and counterparties was$48.1 million and $47.0 million as of December 31, 2017 and September 30, 2017, respectively. During the three months ended December 31, 2017, the Company recorded bad debt expense of $1.1 million, primarily related to the Company’s Physical Commodities segment. During the three months ended December 31, 2017, the Company recorded an additional provision related to a bad debt in the physical coal business for amounts due to the Company from a coal supplier for demurrage and other charges related to contracts with delivery dates subsequent to September 30, 2017. During the three months ended December 31, 2016, the Company recorded bad debt expense of $2.5 million. The provision for bad debts was primarily related to $2.5 million of LME Metals customer deficits in the Company’s Commercial Hedging segment.

X
- Definition Receivables from customers and notes receivable, net [Abstract] + References No definition available. + Details
Name: | intl_ReceivablesFromCustomersAndNotesReceivableNetAbstract
Namespace Prefix: | intl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for financing receivables. Examples of financing receivables include, but are not limited to, loans, trade accounts receivables, notes receivable, credit cards, and receivables relating to a lessor's right(s) to payment(s) from a lease other than an operating lease that is recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 + Details
Name: | us-gaap_FinancingReceivablesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration