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Goodwill (Tables) | 12 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in goodwill | Changes in the carry value of goodwill allocated segment are as follows (in millions):
| Network Enablement |  | Service Enablement |  | Optical Security and Performance Products |  | Total
Balance as of July 2, 2016 (1) | $ | 143.8 |  |  | $ | — |  |  | $ | 8.3 |  |  | $ | 152.1 |
Currency translation and other adjustments | (0.5 | ) |  | — |  |  | — |  |  | (0.5 | )
Balance as of July 1, 2017 (2) | $ | 143.3 |  |  | $ | — |  |  | $ | 8.3 |  |  | $ | 151.6 |
Acquisitions (4) | 190.1 |  |  | — |  |  | — |  |  | 190.1 |
Currency translation and other adjustments | (5.4 | ) |  | — |  |  | — |  |  | (5.4 | )
Balance as of June 30, 2018 (3) | $ | 328.0 |  |  | $ | — |  |  | $ | 8.3 |  |  | $ | 336.3 |
(1) | 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.
(2) | 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.
(3) | Gross goodwill balances for NE, SE and OSP were $629.9 million, $272.6 million and $92.8 million, respectively as of June 30, 2018. Accumulated impairment for NE, SE and OSP was $301.9 million, $272.6 million and $84.5 million, respectively as of June 30, 2018.
(4) | See “Note 7. Acquisitions” of the Notes to Consolidated Financial Statement for additional information related to our acquisitions.
Schedule of gross goodwill and accumulated impairment balances | The following table presents gross goodwill and aggregate impairment balances for the fiscal years ended June 30, 2018, and July 1, 2017, (in millions):
| Year Ended
| June 30, 2018 |  | July 1, 2017
Gross goodwill balance | $ | 995.3 |  |  | $ | 810.6 |
Accumulated impairment losses | (659.0 | ) |  | (659.0 | )
Net goodwill balance | $ | 336.3 |  |  | $ | 151.6 |

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