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Goodwill and Intangible Assets - Goodwill (Details) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 02, 2018 USD ($) | Jul. 19, 2017 business segment | Mar. 31, 2018 USD ($) | Sep. 30, 2017 segment | Mar. 31, 2017 USD ($) | Jul. 20, 2017 USD ($)
Goodwill |  |  |  |  |  |
Number of businesses Company is managed and operated as | business |  | 1 |  |  |  |
Number of reportable segments | segment |  | 1 |  |  |  |
Number of operating segments | segment |  |  |  | 3 |  |
Changes in goodwill |  |  |  |  |  |
Balance at the beginning of the period |  |  | $ 844,883,000 |  |  |
Goodwill adjustment allocated to BondPoint |  |  | (8,300,000) |  |  |
Balance at the end of the period |  |  | 836,583,000 |  |  |
Goodwill |  |  | 844,883,000 |  |  |
Goodwill impairment |  |  | 0 |  | $ 0 |
Market Making |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |
Balance at the beginning of the period |  |  | 755,292,000 |  |  |
Goodwill adjustment allocated to BondPoint |  |  | 0 |  |  |
Balance at the end of the period |  |  | 755,292,000 |  |  |
Goodwill |  |  | 755,292,000 |  |  | $ 96,200,000
Execution Services |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |
Balance at the beginning of the period |  |  | 89,591,000 |  |  |
Goodwill adjustment allocated to BondPoint |  |  | (8,300,000) |  |  |
Balance at the end of the period |  |  | 81,291,000 |  |  |
Goodwill |  |  | 89,591,000 |  |  |
Corporate |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |
Balance at the beginning of the period |  |  | 0 |  |  |
Goodwill adjustment allocated to BondPoint |  |  | 0 |  |  |
Balance at the end of the period |  |  | 0 |  |  |
Goodwill |  |  | $ 0 |  |  |
BondPoint | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |
Goodwill adjustment allocated to BondPoint | $ (8,300,000) |  |  |  |  |

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