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Revenues From Contracts With Clients Interest Income (Policies) | 3 Months Ended
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Dec. 31, 2018
Interest Income [Abstract] |
Revenue Recognition, Interest [Policy Text Block] | Interest Income Interest income is generated from client funds deposited with the Company to satisfy margin requirements which is held by third-party banks or on deposit with or pledged to exchange-clearing organizations or other FCMs. Interest income is also generated from the investment of client funds in allowable securities, primarily U.S. Treasury obligations. Interest income is also generated from trading fixed income securities that the Company holds in its market-making businesses. Interest income also includes interest generated from collateralized transactions, including securities borrowed and securities purchased under agreements to resell, and from extending margin loans to clients. Interest income is recognized on an accrual basis and is not within the scope of Topic 606.

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- Definition Interest Income [Abstract] + References No definition available. + Details
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- Definition Disclosure of accounting policy for recognition of interest revenue. Disclosure may include the method of recognizing interest income on loan and trade receivables, the method of amortizing premiums or accreting discounts, and a statement about the policy for the treatment of related fees and costs, including the method of amortizing net deferred fees and costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph SAB Topic 13.B.Q1 -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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