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Goodwill (Tables) | 12 Months Ended
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Jul. 01, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in goodwill | The following table presents the changes in goodwill allocated to the Company’s reportable segments (in millions):
| Network Enablement |  | Service Enablement |  | Optical Security and Performance Products |  | Total
Balance as of June 27, 2015 (1) | $ | 154.5 |  |  | $ | 92.7 |  |  | $ | 8.3 |  |  | $ | 255.5 |
Goodwill allocation - WaveReady (3) | (6.0 | ) |  | — |  |  | — |  |  | $ | (6.0 | )
Currency translation and other adjustments | (4.7 | ) |  | (1.3 | ) |  | — |  |  | $ | (6.0 | )
Goodwill impairment charge | — |  |  | (91.4 | ) |  | — |  |  | (91.4 | )
Balance as of July 2, 2016 (2) | $ | 143.8 |  |  | $ | — |  |  | $ | 8.3 |  |  | $ | 152.1 |
Currency translation | (0.5 | ) |  | — |  |  | — |  |  | $ | (0.5 | )
Balance as of July 1, 2017 (4) | $ | 143.3 |  |  | $ | — |  |  | $ | 8.3 |  |  | $ | 151.6 |
(1) | Gross goodwill balances for NE, SE and OSP were $456.4 million, $273.9 million and $92.8 million, respectively as of June 27, 2015. Accumulated impairment for NE, SE and OSP was $301.9 million, $181.2 million and $84.5 million, respectively as of June 27, 2015.
(2) | Gross goodwill balances for NE, SE and OSP were $445.7 million, $272.6 million and $92.8 million, respectively as of July 2, 2016. Accumulated impairment for NE, SE and OSP was $301.9 million, $272.6 million and $84.5 million, respectively as of July 2, 2016.
(3) | Amount represents a release of the relative fair value of goodwill in our NE reporting unit related to the WaveReady products line, which is now a part of Lumentum as of the Separation Date. Refer to “Note 3. Discontinued Operations” for more information about the Separation.
(4) | Gross goodwill balances for NE, SE and OSP were $445.2 million, $272.6 million and $92.8 million, respectively as of July 1, 2017. Accumulated impairment for NE, SE and OSP was $301.9 million, $272.6 million and $84.5 million, respectively as of July 1, 2017.
Schedule of gross goodwill and accumulated impairment balances | The following table presents gross goodwill and aggregate impairment balances for the fiscal years ended July 1, 2017, and July 2, 2016 (in millions):
| years ended
| July 1, 2017 |  | July 2, 2016
Gross goodwill balance | $ | 810.6 |  |  | $ | 811.1 |
Accumulated impairment losses | (659.0 | ) |  | (659.0 | )
Net goodwill balance | $ | 151.6 |  |  | $ | 152.1 |

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