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Income Taxes (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Operating Loss Carryforwards [Line Items] |  |
Provision for income taxes | $ 1,675 | $ 907
Unrecognized tax benefits | 19,200 |
Unrecognized tax benefit future impact if recognized | 19,200 |
Enterasys, Zebra WLAN Business and Avaya Networking |  |
Operating Loss Carryforwards [Line Items] |  |
Tax amortization deduction for capitalized goodwill | 1,600 | $ 1,100
Deferred tax liability, goodwill | $ 6,900 |
Amortization period for tax purposes | 15 years |

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