Income Taxes (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2012
Operating Loss Carryforwards [Line Items]
Change in valuation allowance for fiscal year		$ 25,100	$ 30,500
Federal tax net operating loss carry-forwards		330,600
State tax net operating loss carry-forwards		169,600
Tax credit carry-forwards	$ 28,882	30,824	30,019
Amount of earnings to be reinvested indefinitely of certain foreign corporations		9,300
Unrecognized income tax (benefit) for undistributed foreign earnings		300
Unrecognized tax benefits	10,898	11,359	11,600	$ 25,746
Estimated interest and penalties related to underpayment of income taxes, less than	100	100	100
Accrued interest and penalties, less than	$ 100	100	$ 100
Federal
Operating Loss Carryforwards [Line Items]
Deductions from share-based compensation		38,600
Tax credit carry-forwards		20,300
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		53,100
CITI MATCH AUSTRALIA
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards		9,800
INSTINET JAPAN
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards		300
SINGAPORE EXCHANGE
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards		$ 1,400