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Operating Segments and Geographic Information - Summary of Reportable Segments (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Jul. 02, 2016 USD ($) | Apr. 02, 2016 USD ($) | Jan. 02, 2016 USD ($) | Oct. 03, 2015 USD ($) | Sep. 27, 2014 subsegment | Jul. 01, 2017 USD ($) subsegment segment | Jul. 02, 2016 USD ($) | Jun. 27, 2015 USD ($)
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Number of broad business categories (in segment) | segment |  |  |  |  |  |  |  |  |  | 2 |  |
Net revenue | $ 198.1 | $ 196.0 | $ 206.5 | $ 210.8 | $ 224.1 | $ 220.4 | $ 232.1 | $ 229.7 |  | $ 811.4 | $ 906.3 | $ 873.9
Gross profit | $ 119.2 | $ 117.0 | $ 124.7 | $ 125.1 | $ 136.1 | $ 131.3 | $ 141.8 | $ 140.5 |  | $ 486.0 | $ 549.7 | $ 520.1
Gross margin |  |  |  |  |  |  |  |  |  | 59.90% | 60.70% | 59.50%
Operating income (loss) |  |  |  |  |  |  |  |  |  | $ 13.6 | $ (84.3) | $ (75.8)
Operating margin |  |  |  |  |  |  |  |  |  | 1.70% | (9.30%) | (8.70%)
Segment Measures |  |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | $ 811.4 | $ 906.3 | $ 873.9
Gross profit |  |  |  |  |  |  |  |  |  | $ 506.3 | $ 572.2 | $ 557.4
Gross margin |  |  |  |  |  |  |  |  |  | 62.40% | 63.10% | 63.80%
Operating income (loss) |  |  |  |  |  |  |  |  |  | $ 107.6 | $ 115.6 | $ 68.0
Operating margin |  |  |  |  |  |  |  |  |  | 13.30% | 12.80% | 7.80%
Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.0
Gross profit |  |  |  |  |  |  |  |  |  | (20.3) | (22.5) | (37.3)
Operating income (loss) |  |  |  |  |  |  |  |  |  | $ (94.0) | (199.9) | (143.8)
Network and Service Enablement |  |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Number of subsegments (in subsegment) | subsegment |  |  |  |  |  |  |  |  | 2 | 2 |  |
Network and Service Enablement | Segment Measures |  |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | $ 579.2 | 658.2 | 681.1
Gross profit |  |  |  |  |  |  |  |  |  | $ 372.5 | $ 429.1 | $ 453.1
Gross margin |  |  |  |  |  |  |  |  |  | 64.30% | 65.20% | 66.50%
Operating income (loss) |  |  |  |  |  |  |  |  |  | $ 7.3 | $ 12.7 | $ (0.1)
Operating margin |  |  |  |  |  |  |  |  |  | 1.30% | 1.90% | 0.00%
Network and Service Enablement | Network Enablement | Segment Measures |  |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | $ 444.0 | $ 504.6 | $ 506.8
Gross profit |  |  |  |  |  |  |  |  |  | $ 286.3 | $ 329.7 | $ 333.9
Gross margin |  |  |  |  |  |  |  |  |  | 64.50% | 65.30% | 65.90%
Network and Service Enablement | Service Enablement | Segment Measures |  |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | $ 135.2 | $ 153.6 | $ 174.3
Gross profit |  |  |  |  |  |  |  |  |  | $ 86.2 | $ 99.4 | $ 119.2
Gross margin |  |  |  |  |  |  |  |  |  | 63.80% | 64.70% | 68.40%
Optical Security and Performance Products | Segment Measures |  |  |  |  |  |  |  |  |  |  |  |
Information on reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | $ 232.2 | $ 248.1 | $ 192.8
Gross profit |  |  |  |  |  |  |  |  |  | $ 133.8 | $ 143.1 | $ 104.3
Gross margin |  |  |  |  |  |  |  |  |  | 57.60% | 57.70% | 54.10%
Operating income (loss) |  |  |  |  |  |  |  |  |  | $ 100.3 | $ 102.9 | $ 68.1
Operating margin |  |  |  |  |  |  |  |  |  | 43.20% | 41.50% | 35.30%

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