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Income Taxes (Narratives) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Income tax provision (benefit) | $ 1,877,000 | $ 1,729,000 |  |  | $ (1,991,000) | $ 1,800,000 | $ 1,787,000 |  |
State net operating loss | 0 | $ 0 |  |  | 0 |  | 0 |  |
Tax benefit, foreign |  |  |  |  | 2,600,000 |  |  |  |
Tax benefit |  |  | $ 2,500,000 |  | $ 4,700,000 |  | $ 2,500,000 | $ 2,500,000 |
U.S. Federal tax rate |  |  |  | 35.00% | 21.00% |  | 35.00% |  |
Description of effective date of enacted tax rate implementation |  |  |  |  | Effective for tax years beginning on or after January 1, 2018. |  |  |  |
Additional tax provision resulting corresponding reduction in valuation allowance |  |  |  |  |  |  |  |  | $ 0
Reduced valuation allowance | 4,700,000 |  |  |  | $ 4,700,000 |  |  |  |
Unrecognized tax benefits | 17,400,000 |  |  |  | 17,400,000 |  |  |  |
Unrecognized tax benefit future impact if recognized | 17,400,000 |  |  |  | $ 17,400,000 |  |  |  |
State |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Income tax examination, years under examination |  |  |  |  | 2014 2015 2016 |  |  |  |
Enterasys, Zebra WLAN Business, Campus Fabric Business and Brocade Data Center Business |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Tax amortization deduction for capitalized goodwill | 1,800,000 |  |  |  | $ 5,800,000 |  |  |  |
Deferred tax liability, goodwill | $ 6,800,000 |  |  |  | $ 6,800,000 |  |  |  |
Amortization period of intangible assets resulting from acquisitions |  |  |  |  | 15 years |  |  |  |
Ireland | Subsidiary |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Amortization period of intangible assets resulting from acquisitions |  |  |  |  | 6 years |  |  |  |
ASU 2016-16 | Ireland | Subsidiary |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax asset relating to a transfer of certain assets to subsidiary |  |  |  |  |  | $ 3,700,000 |  |  |

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