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Operating Segments and Geographic Information - Information on Reportable Segments (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 30, 2017 USD ($) subsegment segment | Dec. 31, 2016 USD ($)
Information on reportable segments |  |  |  |
Number of broad business categories (in segment) | segment |  |  | 2 |
Net revenue | $ 201.8 | $ 206.5 | $ 397.0 | $ 417.3
Gross profit | $ 116.1 | $ 124.7 | $ 232.3 | $ 249.8
Gross margin (as a percent) | 57.50% | 60.40% | 58.50% | 59.90%
Operating income | $ 3.7 | $ 6.7 | $ 13.7 | $ 16.8
Operating margin (as a percent) | 1.80% | 3.20% | 3.50% | 4.00%
Segment Measures |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | $ 201.8 | $ 206.5 | $ 397.0 | $ 417.3
Gross profit | $ 122.4 | $ 129.9 | $ 244.9 | $ 260.2
Gross margin (as a percent) | 60.70% | 62.90% | 61.70% | 62.40%
Operating income | $ 25.4 | $ 26.9 | $ 54.8 | $ 54.4
Operating margin (as a percent) | 12.60% | 13.00% | 13.80% | 13.00%
Reconciling Items |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Gross profit | (6.3) | (5.2) | (12.6) | (10.4)
Operating income | (21.7) | (20.2) | $ (41.1) | (37.6)
Network and Service Enablement |  |  |  |
Information on reportable segments |  |  |  |
Number of subsegments (in subsegment) | subsegment |  |  | 2 |
Network and Service Enablement | Segment Measures |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | 153.6 | 157.6 | $ 294.4 | 312.6
Gross profit | $ 96.2 | $ 101.7 | $ 187.3 | $ 200.4
Gross margin (as a percent) | 62.60% | 64.50% | 63.60% | 64.10%
Operating income | $ 8.0 | $ 6.0 | $ 15.2 | $ 10.1
Operating margin (as a percent) | 5.20% | 3.80% | 5.20% | 3.20%
Network and Service Enablement | Network Enablement | Segment Measures |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | $ 121.5 | $ 117.0 | $ 233.3 | $ 235.6
Gross profit | $ 73.8 | $ 74.6 | $ 144.4 | $ 152.0
Gross margin (as a percent) | 60.70% | 63.80% | 61.90% | 64.50%
Network and Service Enablement | Service Enablement | Segment Measures |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | $ 32.1 | $ 40.6 | $ 61.1 | $ 77.0
Gross profit | $ 22.4 | $ 27.1 | $ 42.9 | $ 48.4
Gross margin (as a percent) | 69.80% | 66.70% | 70.20% | 62.90%
Optical Security and Performance Products | Segment Measures |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | $ 48.2 | $ 48.9 | $ 102.6 | $ 104.7
Gross profit | $ 26.2 | $ 28.2 | $ 57.6 | $ 59.8
Gross margin (as a percent) | 54.40% | 57.70% | 56.10% | 57.10%
Operating income | $ 17.4 | $ 20.9 | $ 39.6 | $ 44.3
Operating margin (as a percent) | 36.10% | 42.70% | 38.60% | 42.30%

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