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Income Taxes (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Operating Loss Carryforwards [Line Items] |  |  |  |
Change in valuation allowance for fiscal year | $ 18,000 | $ 3,800 |  |
Federal tax net operating loss carry-forwards | 291,300 |  |  |
State tax net operating loss carry-forwards | 93,700 |  |  |
Tax credit carry-forwards | 34,444 | 32,730 | $ 30,824 |
Amount of earnings to be reinvested indefinitely of certain foreign corporations | 11,500 |  |  |
Unrecognized income tax (benefit) for undistributed foreign earnings | 200 |  |  |
Unrecognized tax benefits | 18,913 | 11,653 | 11,359 | $ 11,600
Estimated interest and penalties related to underpayment of income taxes, less than | $ 100 | $ 100 | $ 100 |
Enterasys Networks, Inc. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Amortization period of intangible assets and goodwill resulting from acquisition |  |  |  | 15 years
Zebra Technologies Corporation |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Amortization period of intangible assets and goodwill resulting from acquisition | 15 years |  |  |
MTS IRELAND |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating Loss Carryforwards | $ 46,700 |  |  |
CITI MATCH AUSTRALIA |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating Loss Carryforwards | 9,800 |  |  |
BRAZILIAN ENERGY EXCHANGE |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating Loss Carryforwards | 7,300 |  |  |
INSTINET JAPAN |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating Loss Carryforwards | 300 |  |  |
Foreign |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carry-forwards | 8,100 |  |  |
State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carry-forwards | 16,400 |  |  |
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 | 15,500 |  |  |
Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carry-forwards | 23,800 |  |  |
Federal | Subject To Expiration |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carry-forwards | $ 15,500 |  |  |

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