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Income Taxes (Narratives) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2014 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Change in valuation allowance for fiscal year |  | $ (8,500) | $ (34,200) |  |  |  |  |
Federal tax net operating loss carry-forwards |  | 126,600 |  |  |  |  |  |
State tax net operating loss carry-forwards |  | 56,700 |  |  |  |  |  |
Tax credit carry-forwards |  | 54,745 | 48,093 | $ 34,444 |  |  |  |
Amount of cumulative undistributed earnings to be reinvested indefinitely of non-U.S. subsidiaries |  | 6,800 |  |  |  |  |  |
Deferred tax liability related to withholding taxes of certain foreign subsidiaries |  | 505 | $ 357 | 321 |  |  |  |
Unrecorded deferred tax liability for potential withholding tax of unrecognized foreign earnings |  | $ 3,400 |  |  |  |  |  |
Description of effective date of enacted tax rate implementation |  | effective for tax years beginning on or after January 1, 2018 |  |  |  |  |  |
Federal statutory income tax rate (percent) | 35.00% | 21.00% | 28.00% |  |  |  |  |
Tax benefit |  |  | $ 2,500 |  |  |  |  |
Reduced valuation allowance |  |  |  |  |  | $ 4,700 |  |
Deferred intercompany gain |  | $ 3,693 |  |  |  |  |  |
Unrecognized tax benefits |  | 17,168 | 17,506 | 18,913 |  |  |  | $ 11,653
Unrecognized tax benefit future impact if recognized |  | 17,200 |  |  |  |  |  |
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 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 |  | $ 7,700 |  |  |  |  |  |
MTS IRELAND |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  | 36,900 |  |  |  |  |  |
CITI MATCH AUSTRALIA |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  | 7,900 |  |  |  |  |  |
BRAZILIAN ENERGY EXCHANGE |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  | 400 |  |  |  |  |  |
Ireland | Subsidiary | ASU 2016-16 |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Deferred intercompany gain |  |  |  |  |  |  | $ 3,700 |
Foreign |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | 10,700 |  |  |  |  |  |
State |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | 22,100 |  |  |  |  |  |
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 |  | 21,200 |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | 37,300 |  |  |  |  |  |
Federal | Subject To Expiration |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | $ 26,600 |  |  |  |  |  |

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