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Capital Structure (Details) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended	11 Months Ended
	Jan. 13, 2016 USD ($)	Apr. 21, 2015 $ / shares shares	Mar. 31, 2016 USD ($) Vote item $ / shares shares	Jan. 31, 2016 USD ($)	Mar. 31, 2016 Vote $ / shares shares	Dec. 31, 2015 $ / shares shares	Nov. 30, 2015 $ / shares shares	Apr. 15, 2015 shares
Number of classes of common stock | item			4
Number of votes provided to holders on all matters | Vote			10		10
Payments of dividends | $			$ 9,378
Maximum
Remaining dividends payable | $				$ 30,000
Virtu Financial
Ownership interest (as a percent)			28.10%		28.10%
Virtu Financial
Payments of dividends | $	$ 5,000			$ 20,000
Non-qualified stock options
Options outstanding (in shares)			8,369,000		8,369,000	8,994,000
Non-qualified stock options | 2015 Management Incentive Plan
Vesting period		4 years
Expiration period		10 years
Restricted stock units | 2015 Management Incentive Plan
Vesting period					4 years
Granted (in shares)					984,466
Class A
Number of shares of stock issued		19,012,112
Common stock, par value (in dollars per share) | $ / shares		$ 0.00001	$ 0.00001		$ 0.00001	$ 0.00001
Common stock sold in connection with full exercise of the option to purchase additional shares granted to underwriters (in shares)		2,479,840
Common stock sold in connection with full exercise of the option to purchase additional shares granted to underwriters, at a price to public (in dollars per share) | $ / shares		$ 19.00
Common stock shares issued			38,379,858		38,379,858	38,379,858		16,532,272
Common stock, outstanding			38,210,209		38,210,209	38,210,209
Common stock offered for sale (in shares)							397,534
Class A | 2015 Management Incentive Plan
Number of shares of stock authorized		12,000,000
Class A | Silver Lake Post-IPO
Common stock offered for sale (in shares)							6,075,837
Class A | Virtu Financial Inc And Silver Lake Partners
Common stock offered for sale (in shares)							6,473,371
Price of stock (in dollars per share) | $ / shares							$ 22.15
Class B
Common stock, par value (in dollars per share) | $ / shares			$ 0.00001		$ 0.00001	$ 0.00001
Common stock shares issued			0		0	0
Common stock, outstanding			0		0	0
Class C
Common stock, par value (in dollars per share) | $ / shares			$ 0.00001		$ 0.00001	$ 0.00001
Common stock shares issued			20,976,598		20,976,598	20,976,598
Common stock, outstanding			20,922,855		20,922,855	20,976,598
Class D
Common stock, par value (in dollars per share) | $ / shares			$ 0.00001		$ 0.00001	$ 0.00001
Common stock shares issued			79,610,490		79,610,490	79,610,490
Common stock, outstanding			79,610,490		79,610,490	79,610,490

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