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Organization and Basis of Presentation (Details) $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 02, 2018 USD ($) | Jul. 19, 2017 business segment | Mar. 31, 2018 USD ($) | Sep. 30, 2017 segment | Mar. 31, 2017 USD ($)
Organization, Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Proceeds from sale of business | $ |  |  | $ 400,192 |  | $ 0
Number of businesses Company is managed and operated as | business |  | 1 |  |  |
Number of reportable segments | segment |  | 1 |  |  |
Number of operating segments | segment |  |  |  | 3 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | BondPoint |  |  |  |  |
Organization, Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Proceeds from sale of business | $ | $ 400,192 |  |  |  |
Virtu Financial |  |  |  |  |
Organization, Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Ownership interest (as a percent) |  |  | 49.10% |  |

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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