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Revenues From Contracts With Clients Practical Expedients (Policies) | 3 Months Ended
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Dec. 31, 2018
Practical Expedients [Abstract] |
Revenue, Practical Expedient, Remaining Performance Obligation [true/false] | <div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company has applied Topic 606’s practical expedient that permits for the non-disclosure of the value of performance obligations for (i) contracts with an original expected length or one year or less and (ii) contracts for which the Company recognizes revenue at the amount to which is has the right to invoice for services performed. </font></div></div>

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- Definition Practical Expedients [Abstract] + References No definition available. + Details
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Namespace Prefix: | intl_
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- Definition Description of consideration that is not included in transaction price and not allocated to remaining performance obligation. Includes, but is not limited to, variable consideration that is constrained. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130558-203045 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration