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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)

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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