Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Operating Loss Carryforwards [Line Items]
Change in valuation allowance for fiscal year	$ 3,800	$ 25,100
Federal tax net operating loss carry-forwards	322,700
State tax net operating loss carry-forwards	138,300
Tax credit carry-forwards	32,730	30,824	$ 30,019
Amount of earnings to be reinvested indefinitely of certain foreign corporations	10,300
Unrecognized income tax (benefit) for undistributed foreign earnings	300
Unrecognized tax benefits	11,653	11,359	11,600	$ 10,898
Estimated interest and penalties related to underpayment of income taxes, less than	100	$ 100	$ 100
Foreign
Operating Loss Carryforwards [Line Items]
Tax credit carry-forwards	7,500
State
Operating Loss Carryforwards [Line Items]
Deductions from share-based compensation	36,000
Tax credit carry-forwards	16,200
State | Subject To Expiration
Operating Loss Carryforwards [Line Items]
Tax credit carry-forwards	900
State | Not Subject To Expiration
Operating Loss Carryforwards [Line Items]
Tax credit carry-forwards	15,300
MTS IRELAND
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	41,400
CITI MATCH AUSTRALIA
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	9,400
INSTINET JAPAN
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	400
Federal
Operating Loss Carryforwards [Line Items]
Deductions from share-based compensation	38,600
Tax credit carry-forwards	22,100
Federal | Subject To Expiration
Operating Loss Carryforwards [Line Items]
Tax credit carry-forwards	$ 14,200