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Income Taxes (Narratives) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 22, 2017 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2014 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Change in valuation allowance for fiscal year |  |  | $ 63,500 | $ (8,500) |  |  |  |
Federal tax net operating loss carry-forwards |  | $ 287,500 | 287,500 |  |  |  |  |
State tax net operating loss carry-forwards |  | 156,400 | 156,400 |  |  |  |  |
Tax credit carry-forwards |  | 67,364 | 67,364 | 54,745 | $ 48,093 |  |  |
Amount of cumulative undistributed earnings to be reinvested indefinitely of non-U.S. subsidiaries |  | 9,100 | 9,100 |  |  |  |  |
Deferred tax liability related to withholding taxes of certain foreign subsidiaries |  | 551 | 551 | $ 505 | 357 |  |  |
Unrecorded deferred tax liability for potential withholding tax of unrecognized foreign earnings |  | 4,800 | $ 4,800 |  |  |  |  |
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% |  |  |  |  |
Deferred intercompany gain |  | 3,693 | $ 3,693 | $ 3,693 |  |  |  |
Additions resulting from the acquisition of Aerohive |  | 75,000 |  |  |  |  |  |
Unrecognized tax benefits |  | 23,897 | 23,897 | 17,168 | 17,506 | $ 18,913 |  |
Unrecognized tax benefits that would affect the effective tax rate if recognized |  | 500 | 500 |  |  |  |  |
Unrecognized tax benefit future impact if recognized |  | 23,400 | 23,400 |  |  |  |  |
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 |  |
Aerohive Networks, Inc. |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Amortization period of intangible assets and goodwill resulting from acquisition |  |  | 10 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 |  |  | $ 7,600 |  |  |  |  |
MTS IRELAND |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  | 21,000 | 21,000 |  |  |  |  |
CITI MATCH AUSTRALIA |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  | 7,600 | 7,600 |  |  |  |  |
BRAZILIAN ENERGY EXCHANGE |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  | 700 | 700 |  |  |  |  |
Ireland | Subsidiary | ASU 2016-16 |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Deferred intercompany gain |  |  |  |  |  |  |  | $ 7,200
Foreign |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | 10,900 | 10,900 |  |  |  |  |
State |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | 29,800 | 29,800 |  |  |  |  |
State | Subject To Expiration |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | 900 | 900 |  |  |  |  |
State | Not Subject To Expiration |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | 28,900 | 28,900 |  |  |  |  |
Federal |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | 43,800 | 43,800 |  |  |  |  |
Federal | Subject To Expiration |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carry-forwards |  | $ 32,900 | $ 32,900 |  |  |  |  |

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