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Income Taxes (Narratives) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 22, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Provision for income taxes |  | $ 1,729,000 |  | $ 1,166,000 |  | $ 1,787,000 | $ 3,252,000
U.S. Federal tax rate |  | 21.00% |  |  | 35.00% |  |
Tax provision offset by tax benefit |  |  |  |  |  | $ 2,500,000 |
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 |  |  |  |
Additional tax provision resulting corresponding reduction in valuation allowance |  | $ 0 |  |  |  | $ 0 |
Unrecognized tax benefits |  | 18,500,000 |  |  |  | 18,500,000 |
Unrecognized tax benefit future impact if recognized |  | 18,500,000 |  |  |  | 18,500,000 |
Enterasys, Zebra WLAN Business and Campus Fabric Business |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Tax amortization deduction for capitalized goodwill |  | 1,800,000 |  |  |  | 5,500,000 |
Deferred tax liability, goodwill |  | $ 5,300,000 |  |  |  | $ 5,300,000 |
Amortization period for tax purposes |  |  |  |  |  | 15 years |
Fiscal 2018 |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
U.S. Federal tax rate | 28.00% |  |  |  |  |  |

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