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Operating Segments and Geographic Information - Information on Reportable Segments (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Apr. 01, 2017 USD ($) | Mar. 31, 2018 USD ($) subsegment segment | Apr. 01, 2017 USD ($)
Information on reportable segments |  |  |  |
Number of broad business categories (in segment) | segment |  |  | 2 |
Net revenue | $ 219.4 | $ 196.0 | $ 616.4 | $ 613.3
Gross profit | $ 123.7 | $ 117.0 | $ 356.0 | $ 366.8
Gross margin (as a percent) | 56.40% | 59.70% | 57.80% | 59.80%
Operating income | $ 0.4 | $ (15.2) | $ 14.1 | $ 1.6
Operating margin (as a percent) | 0.20% | (7.80%) | 2.30% | 0.30%
Segment Measures |  |  |  |
Information on reportable segments |  |  |  |
Gross profit | $ 134.4 | $ 121.9 | $ 379.3 | $ 382.1
Operating income | 33.2 | 23.4 | 88.0 | 77.8
Other Items |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | 0.0 | 0.0 | 0.0 | 0.0
Gross profit | (10.7) | (4.9) | (23.3) | (15.3)
Operating income | (32.8) | (38.6) | $ (73.9) | (76.2)
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 | 157.1 | 132.1 | $ 451.5 | 444.7
Gross profit | $ 101.6 | $ 85.2 | $ 288.9 | $ 285.6
Gross margin (as a percent) | 64.70% | 64.50% | 64.00% | 64.20%
Operating income | $ 9.6 | $ (4.4) | $ 24.8 | $ 5.7
Operating margin (as a percent) | 6.10% | (3.30%) | 5.50% | 1.30%
Network and Service Enablement | Network Enablement | Segment Measures |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | $ 127.0 | $ 103.4 | $ 360.3 | $ 339.0
Gross profit | $ 80.9 | $ 67.5 | $ 225.3 | $ 219.5
Gross margin (as a percent) | 63.70% | 65.30% | 62.50% | 64.70%
Network and Service Enablement | Service Enablement | Segment Measures |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | $ 30.1 | $ 28.7 | $ 91.2 | $ 105.7
Gross profit | $ 20.7 | $ 17.7 | $ 63.6 | $ 66.1
Gross margin (as a percent) | 68.80% | 61.70% | 69.70% | 62.50%
Optical Security and Performance Products | Segment Measures |  |  |  |
Information on reportable segments |  |  |  |
Net revenue | $ 62.3 | $ 63.9 | $ 164.9 | $ 168.6
Gross profit | $ 32.8 | $ 36.7 | $ 90.4 | $ 96.5
Gross margin (as a percent) | 52.60% | 57.40% | 54.80% | 57.20%
Operating income | $ 23.6 | $ 27.8 | $ 63.2 | $ 72.1
Operating margin (as a percent) | 37.90% | 43.50% | 38.30% | 42.80%

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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