XML 25 R12.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Receivables From Customers, Net and Notes Receivable, Net (Notes) | 6 Months Ended
--- | ---
Mar. 31, 2018
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 $7.8 million and $7.6 million as of March 31, 2018 and September 30, 2017, respectively. 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 March 31, 2018 and September 30, 2017, respectively. During the three months ended March 31, 2018, the Company recorded bad debt expense of $0.2 million. The bad debt expense was primarily related to a precious metals customer trading account deficit in the Company’s Physical Commodities segment, partially offset by bad debt recoveries in the Physical Commodities and Commercial Hedging segments. During the three months ended March 31, 2017, the Company recorded bad debt expense of $1.3 million, primarily related to LME Metals customer deficits in the Company’s Commercial Hedging Segment. During the six months ended March 31, 2018, the Company recorded bad debt expense of $1.3 million. The provision for bad debts was primarily related an additional provision of $1.0 million 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 six months ended March 31, 2017, the Company recorded bad debt expense of $3.8 million, primarily related to 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 allowance for credit losses. + 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_AllowanceForCreditLossesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration