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Income Taxes (Narratives) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2014 | Jun. 30, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Change in valuation allowance for fiscal year |  |  |  |  | $ (34,200,000) | $ 15,500,000 |  |  |
Federal tax net operating loss carry-forwards |  |  | $ 185,600,000 |  | 185,600,000 |  |  |  |
State tax net operating loss carry-forwards |  |  | 54,400,000 |  | 54,400,000 |  |  |  |
Tax credit carry-forwards |  |  | 48,093,000 |  | 48,093,000 | 34,444,000 | $ 32,730,000 |  |
Amount of cumulative undistributed earnings to be reinvested indefinitely of non-U.S. subsidiaries |  |  | 14,100,000 |  | 14,100,000 |  |  |  |
Deferred tax liability related to withholding taxes of certain foreign subsidiaries |  |  | 357,000 |  | 357,000 | 321,000 | 235,000 |  |
Unrecorded deferred tax liability for potential withholding tax of unrecognized foreign earnings |  |  | $ 2,700,000 |  | $ 2,700,000 |  |  |  |
Description of effective date of enacted tax rate implementation |  |  |  |  | Effective for tax years beginning on or after January 1, 2018. |  |  |  |
Tax benefit |  |  |  |  | $ 2,500,000 |  |  |  |
U.S. Federal tax rate |  |  | 21.00% | 35.00% | 28.00% |  |  |  |
Tax benefit |  | $ 2,500,000 |  |  | $ 13,061,000 | (909,000) | 11,209,000 |  |
Additional tax provision resulting corresponding reduction in valuation allowance |  |  | $ 0 |  | 0 |  |  |  |
Unrecognized tax benefits |  |  | 17,506,000 |  | 17,506,000 | 18,913,000 | 11,653,000 |  | $ 11,359,000
Unrecognized tax benefit future impact if recognized |  |  | 17,500,000 |  | 17,500,000 |  |  |  |
Estimated interest and penalties related to underpayment of income taxes, less than |  |  |  |  | $ 100,000 | $ 100,000 | $ 100,000 |  |
Enterasys Networks, Inc. |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Amortization period of intangible assets and goodwill resulting from acquisition |  |  |  |  |  |  |  | 15 years |
Zebra WLAN Business, Avaya Campus Fabric Business and Brocade Data Center Business |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Amortization period of intangible assets and goodwill resulting from acquisition |  |  |  |  | 15 years |  |  |  |
Enterasys Networks Inc, Zebra WLAN Business, Avaya Campus Fabric Business and Brocade Data Center Business |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Tax amortization deduction for capitalized goodwill |  |  |  |  | $ 7,500,000 |  |  |  |
Fiscal 2018 |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
U.S. Federal tax rate | 28.00% |  |  |  |  |  |  |  |
MTS IRELAND |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  | 37,500,000 |  | 37,500,000 |  |  |  |
CITI MATCH AUSTRALIA |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  | 9,000,000 |  | 9,000,000 |  |  |  |
BRAZILIAN ENERGY EXCHANGE |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  | 700,000 |  | 700,000 |  |  |  |
Foreign |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Tax credit carry-forwards |  |  | 10,600,000 |  | 10,600,000 |  |  |  |
State |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Tax credit carry-forwards |  |  | 18,800,000 |  | 18,800,000 |  |  |  |
Income tax examination, years under examination |  |  |  |  |  | 2014 2015 2016 |  |  |
State | Subject To Expiration |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Tax credit carry-forwards |  |  | 900,000 |  | 900,000 |  |  |  |
State | Not Subject To Expiration |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Tax credit carry-forwards |  |  | 17,900,000 |  | 17,900,000 |  |  |  |
Federal |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Tax credit carry-forwards |  |  | 33,200,000 |  | 33,200,000 |  |  |  |
Federal | Subject To Expiration |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Tax credit carry-forwards |  |  | $ 22,600,000 |  | $ 22,600,000 |  |  |  |

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