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Operating Segments and Geographic Information - Summary of Reportable Segments (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Jun. 30, 2018 USD ($) segment | Jul. 01, 2017 USD ($) | Jul. 02, 2016 USD ($)
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |
Number of broad business categories (segment) | segment |  |  |  |  |  |  |  |  | 2 |  |
Net revenue | $ 264.0 | $ 219.4 | $ 201.8 | $ 195.2 | $ 198.1 | $ 196.0 | $ 206.5 | $ 210.8 | $ 880.4 | $ 811.4 | $ 906.3
Gross profit | $ 136.2 | $ 123.7 | $ 116.1 | $ 116.2 | $ 119.2 | $ 117.0 | $ 124.7 | $ 125.1 | $ 492.2 | $ 486.0 | $ 549.7
Gross margin (percent) |  |  |  |  |  |  |  |  | 55.90% | 59.90% | 60.70%
Operating income |  |  |  |  |  |  |  |  | $ 5.1 | $ 13.6 | $ (84.3)
Operating margin (percent) |  |  |  |  |  |  |  |  | 0.60% | 1.70% | (9.30%)
Segment Measures |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | $ 880.4 | $ 811.4 | $ 906.3
Gross profit |  |  |  |  |  |  |  |  | $ 535.9 | $ 506.3 | $ 572.2
Gross margin (percent) |  |  |  |  |  |  |  |  | 60.90% | 62.40% | 63.10%
Operating income |  |  |  |  |  |  |  |  | $ 125.0 | $ 107.6 | $ 115.6
Operating margin (percent) |  |  |  |  |  |  |  |  | 14.20% | 13.30% | 12.80%
Other Items |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.0
Gross profit |  |  |  |  |  |  |  |  | (43.7) | (20.3) | (22.5)
Operating income |  |  |  |  |  |  |  |  | (119.9) | (94.0) | (199.9)
Network and Service Enablement | Segment Measures |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 662.3 | 579.2 | 658.2
Gross profit |  |  |  |  |  |  |  |  | $ 420.7 | $ 372.5 | $ 429.1
Gross margin (percent) |  |  |  |  |  |  |  |  | 63.50% | 64.30% | 65.20%
Operating income |  |  |  |  |  |  |  |  | $ 46.8 | $ 7.3 | $ 12.7
Operating margin (percent) |  |  |  |  |  |  |  |  | 7.10% | 1.30% | 1.90%
Network and Service Enablement | Network Enablement | Segment Measures |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | $ 538.5 | $ 444.0 | $ 504.6
Gross profit |  |  |  |  |  |  |  |  | $ 333.6 | $ 286.3 | $ 329.7
Gross margin (percent) |  |  |  |  |  |  |  |  | 61.90% | 64.50% | 65.30%
Network and Service Enablement | Service Enablement | Segment Measures |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | $ 123.8 | $ 135.2 | $ 153.6
Gross profit |  |  |  |  |  |  |  |  | $ 87.1 | $ 86.2 | $ 99.4
Gross margin (percent) |  |  |  |  |  |  |  |  | 70.40% | 63.80% | 64.70%
Optical Security and Performance Products | Segment Measures |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | $ 218.1 | $ 232.2 | $ 248.1
Gross profit |  |  |  |  |  |  |  |  | $ 115.2 | $ 133.8 | $ 143.1
Gross margin (percent) |  |  |  |  |  |  |  |  | 52.80% | 57.60% | 57.70%
Operating income |  |  |  |  |  |  |  |  | $ 78.2 | $ 100.3 | $ 102.9
Operating margin (percent) |  |  |  |  |  |  |  |  | 35.90% | 43.20% | 41.50%

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