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Goodwill (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 02, 2016 USD ($) | Sep. 27, 2014 USD ($) subsegment | Jul. 01, 2017 USD ($) subsegment | Jul. 02, 2016 USD ($) | Jun. 27, 2015 USD ($) | Jul. 01, 2017 USD ($) | Jul. 02, 2016 USD ($) | Jun. 27, 2015 USD ($)
Changes in goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | $ 152.1 | $ 255.5 |  |  |  |
Goodwill allocation - WaveReady |  |  |  | (6.0) |  |  |  |
Currency translation and other adjustments |  |  | (0.5) | (6.0) |  |  |  |
Goodwill impairment charge | $ (91.4) | $ 0.0 | 0.0 | (91.4) | $ 0.0 |  |  |
Balance at the end of the period | 152.1 |  | 151.6 | 152.1 | 255.5 |  |  |
Gross goodwill and accumulated impairment balances |  |  |  |  |  |  |  |
Gross goodwill balance |  |  |  |  |  | $ 810.6 | $ 811.1 |
Accumulated impairment losses |  |  |  |  |  | (659.0) | (659.0) |
Net goodwill balance | 152.1 |  | 152.1 | 255.5 | 255.5 | 151.6 | 152.1 | $ 255.5
Impairment of goodwill | 91.4 | $ 0.0 | 0.0 | $ 91.4 | 0.0 |  |  |
Discounted Cash Flow Approach |  |  |  |  |  |  |  |
Gross goodwill and accumulated impairment balances |  |  |  |  |  |  |  |
Discount period |  |  |  | 10 years |  |  |  |
Minimum | Discounted Cash Flow Approach |  |  |  |  |  |  |  |
Gross goodwill and accumulated impairment balances |  |  |  |  |  |  |  |
Long-term annual growth rate |  |  |  | 3.00% |  |  |  |
Discount rate |  |  |  | 14.00% |  |  |  |
Terminal growth rate |  |  |  | 3.00% |  |  |  |
Maximum | Discounted Cash Flow Approach |  |  |  |  |  |  |  |
Gross goodwill and accumulated impairment balances |  |  |  |  |  |  |  |
Long-term annual growth rate |  |  |  | 7.00% |  |  |  |
Discount rate |  |  |  | 17.00% |  |  |  |
Terminal growth rate |  |  |  | 5.00% |  |  |  |
Network Enablement |  |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | 143.8 | $ 154.5 |  |  |  |
Goodwill allocation - WaveReady |  |  |  | (6.0) |  |  |  |
Currency translation and other adjustments |  |  | (0.5) | (4.7) |  |  |  |
Goodwill impairment charge |  |  |  | 0.0 |  |  |  |
Balance at the end of the period | 143.8 |  | 143.3 | 143.8 | 154.5 |  |  |
Gross goodwill and accumulated impairment balances |  |  |  |  |  |  |  |
Gross goodwill balance |  |  |  |  |  | 445.2 | 445.7 | 456.4
Accumulated impairment losses |  |  |  |  |  | (301.9) | (301.9) | (301.9)
Net goodwill balance | 143.8 |  | 143.8 | 154.5 | 154.5 | 143.3 | 143.8 | 154.5
Impairment of goodwill |  |  |  | 0.0 |  |  |  |
Service Enablement |  |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | 0.0 | 92.7 |  |  |  |
Goodwill allocation - WaveReady |  |  |  | 0.0 |  |  |  |
Currency translation and other adjustments |  |  | 0.0 | (1.3) |  |  |  |
Goodwill impairment charge |  |  |  | (91.4) |  |  |  |
Balance at the end of the period | 0.0 |  | 0.0 | 0.0 | 92.7 |  |  |
Gross goodwill and accumulated impairment balances |  |  |  |  |  |  |  |
Gross goodwill balance |  |  |  |  |  | 272.6 | 272.6 | 273.9
Accumulated impairment losses |  |  |  |  |  | (272.6) | (272.6) | (181.2)
Net goodwill balance | 0.0 |  | 0.0 | 92.7 | 92.7 | 0.0 | 0.0 | 92.7
Impairment of goodwill |  |  |  | 91.4 |  |  |  |
Optical Security and Performance Products |  |  |  |  |  |  |  |
Changes in goodwill |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | 8.3 | 8.3 |  |  |  |
Goodwill allocation - WaveReady |  |  |  | 0.0 |  |  |  |
Balance at the end of the period | 8.3 |  | 8.3 | 8.3 | 8.3 |  |  |
Gross goodwill and accumulated impairment balances |  |  |  |  |  |  |  |
Gross goodwill balance |  |  |  |  |  | 92.8 | 92.8 | 92.8
Accumulated impairment losses |  |  |  |  |  | (84.5) | (84.5) | (84.5)
Net goodwill balance | $ 8.3 |  | $ 8.3 | $ 8.3 | $ 8.3 | $ 8.3 | $ 8.3 | $ 8.3
Network and Service Enablement |  |  |  |  |  |  |  |
Gross goodwill and accumulated impairment balances |  |  |  |  |  |  |  |
Number of subsegments (in subsegment) | subsegment |  | 2 | 2 |  |  |  |  |

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