Note 18. Operating Segments and Geographic Information The Company evaluates its reportable segments in accordance with the authoritative guidance on segment reporting. The Companys Chief Executive Officer is the Companys Chief Operating Decision Maker (CODM), use operating segment financial information to evaluate segment performance and to allocate resources. The Companys reportable segments are: (i) Network Enablement: NE provides testing solutions that access the network to perform build-out and maintenance tasks. These solutions include instruments, software and services to design, build, activate, certify, troubleshoot and optimize networks. The Company also offers a range of product support and professional services such as repair, calibration, software support and technical assistance for our products. (ii) Service Enablement: SE solutions are embedded systems that yield network, service and application performance data. These solutionsincluding instruments, microprobes and softwaremonitor, collect and analyze network data to reveal the actual customer experience and to identify opportunities for new revenue streams and network optimization. (iii) Optical Security and Performance Products: OSP provides innovative, precision, high performance optical products for anti-counterfeiting, government, industrial, automotive and consumer electronic markets, including 3D Sensing applications. The CODM manages the Company in two broad business categories: NSE and OSP. The CODM evaluates segment performance of the NSE business based on the combined segment gross and operating margins. Operating expenses associated with the NSE business are not allocated to the individual segments within NSE, as they are managed centrally at the business unit level. The CODM evaluates segment performance of the OSP business based on segment operating margin. The Company allocates corporate-level operating expenses to its segment results, except for certain non-core operating and non-operating activities as discussed below. The Company does not allocate stock-based compensation, acquisition-related charges, amortization of intangibles, restructuring and related charges, impairment of goodwill, non-operating income and expenses, or other charges unrelated to core operating performance to its segments because management does not include this information in its measurement of the performance of the operating segments. These items are presented as Other Items in the table below. Additionally, the Company does not specifically identify and allocate all assets by operating segment. Information on reportable segments is as follows (in millions): Three Months Ended December 29, 2018 Network Enablement Service Enablement Network and Service Enablement Optical Security and Performance Products Other Items Consolidated GAAP Measures Product revenue $ 176.0 $ 13.8 $ 189.8 $ 83.0 $  $ 272.8 Service revenue 19.5 14.4 33.9 0.2  34.1 Net revenue $ 195.5 $ 28.2 $ 223.7 $ 83.2 $  $ 306.9 Gross profit 125.7 20.3 146.0 41.8 (9.8 ) 178.0 Gross margin 64.3 % 72.0 % 65.3 % 50.2 % 58.0 % Operating income 32.8 31.1 (31.0 ) 32.9 Operating margin 14.7 % 37.4 % 10.7 % Three Months Ended December 30, 2017 Network Enablement Service Enablement Network and Service Enablement Optical Security and Performance Products Other Items Consolidated GAAP Measures Product revenue $ 114.5 $ 19.1 $ 133.6 $ 47.7 $  $ 181.3 Service revenue 7.5 16.1 23.6 0.5  24.1 Net revenue $ 122.0 $ 35.2 $ 157.2 $ 48.2 $  $ 205.4 Gross profit 74.4 25.1 99.5 26.2 (6.3 ) 119.4 Gross margin 61.0 % 71.3 % 63.3 % 54.4 % 58.1 % Operating income 11.2 17.4 (21.7 ) 6.9 Operating margin 7.1 % 36.1 % 3.4 % Three Months Ended December 29, 2018 December 30, 2017 Corporate reconciling items impacting gross profit: Total segment gross profit $ 187.8 $ 125.7 Stock-based compensation (0.9 ) (0.7 ) Amortization of intangibles (8.5 ) (4.1 ) Other charges unrelated to core operating performance (1) (0.4 ) (1.5 ) GAAP gross profit $ 178.0 $ 119.4 Corporate reconciling items impacting operating income: Total segment operating income $ 63.9 $ 28.6 Stock-based compensation (9.6 ) (7.7 ) Amortization of intangibles (18.9 ) (7.5 ) Other charges unrelated to core operating performance (2) (2.2 ) (4.0 ) Restructuring and related charges (0.3 ) (2.5 ) GAAP operating income $ 32.9 $ 6.9 (1) During the three months ended December 29, 2018 and December 30, 2017 , other charges unrelated to core operating performance primarily consisted of acquisition and integration related expenses such as amortization of acquisition related inventory step-up, site consolidations and reorganizations. (2) During the three months ended December 29, 2018 and December 30, 2017 , other charges unrelated to core operating performance primarily consisted of acquisition and integration related transformational initiatives such as the implementation of simplified automated processes, site consolidation and reorganizations, amortization of acquisition related inventory step-up, and loss on disposal of long-lived assets. Six Months Ended December 29, 2018 Network Enablement Service Enablement Network and Service Enablement Optical Security and Performance Products Other Items Consolidated GAAP Measures Product revenue $ 325.9 $ 27.4 $ 353.3 $ 160.6 $  $ 513.9 Service revenue 34.1 27.0 61.1 0.4  61.5 Net revenue 360.0 54.4 414.4 161.0  575.4 Gross profit 228.6 38.6 267.2 81.2 (20.0 ) 328.4 Gross margin 63.5 % 71.0 % 64.5 % 50.4 % 57.1 % Operating income 49.2 58.5 (76.0 ) 31.7 Operating margin 11.9 % 36.3 % 5.5 % Six Months Ended December 30, 2017 Network Enablement Service Enablement Network and Service Enablement Optical Security and Performance Products Other Items Consolidated GAAP Measures Product revenue $ 217.3 $ 27.7 $ 245.0 $ 101.4 $  $ 346.4 Service revenue 16.3 32.4 48.7 1.2  49.9 Net revenue 233.6 60.1 293.7 102.6  396.3 Gross profit 144.7 42.4 187.1 57.6 (12.6 ) 232.1 Gross margin 61.9 % 70.5 % 63.7 % 56.1 % 58.6 % Operating income 15.1 39.6 (41.1 ) 13.6 Operating margin 5.1 % 38.6 % 3.4 % Six Months Ended December 29, 2018 December 30, 2017 Corporate reconciling items impacting gross profit: Total segment gross profit $ 348.4 $ 244.7 Stock-based compensation (1.7 ) (1.6 ) Amortization of intangibles (17.9 ) (8.2 ) Other charges unrelated to core operating performance (1) (0.4 ) (2.8 ) GAAP gross profit $ 328.4 $ 232.1 Corporate reconciling items impacting operating income: Total segment operating income $ 107.7 $ 54.7 Stock-based compensation (17.7 ) (15.2 ) Amortization of intangibles (38.1 ) (14.7 ) Other charges unrelated to core operating performance (2) (5.1 ) (7.2 ) Restructuring and related charges (15.1 ) (4.0 ) GAAP operating income (loss) from continuing operations $ 31.7 $ 13.6 (1) During the six months ended December 29, 2018 and December 30, 2017 , other charges unrelated to core operating performance primarily consisted of acquisition and integration related expenses such as amortization of acquisition related inventory step-up, site consolidations and reorganizations. (2) During the six months ended December 29, 2018 and December 30, 2017 , other charges unrelated to core operating performance primarily consisted of acquisition and integration related transformational initiatives such as the implementation of simplified automated processes, site consolidation and reorganizations, amortization of acquisition related inventory step-up, and loss on disposal of long-lived assets. The Company operates primarily in three geographic regions: Americas, Asia-Pacific, and Europe, Middle East and Africa (EMEA). Net revenue is assigned to the geographic region and country where our product is initially shipped. For example, certain customers may request shipment of our product to a contract manufacturer in one country, which may differ from the location of their end customers. The following table presents net revenue by the three geographic regions we operate in and net revenue from countries that exceeded 10% of our total net revenue, (in millions): Three Months Ended December 29, 2018 December 30, 2017 Product Revenue Service Revenue Total Product Revenue Service Revenue Total Americas: United States $ 89.8 $ 14.3 $ 104.1 $ 76.5 $ 13.8 $ 90.3 Other Americas 17.3 4.0 21.3 20.1 3.6 23.7 Total Americas $ 107.1 $ 18.3 $ 125.4 $ 96.6 $ 17.4 $ 114.0 Asia-Pacific: Greater China $ 64.8 $ 2.1 $ 66.9 $ 28.7 $ 0.4 $ 29.1 Other Asia 30.4 3.6 34.0 15.9 0.9 16.8 Total Asia-Pacific $ 95.2 $ 5.7 $ 100.9 $ 44.6 $ 1.3 $ 45.9 EMEA: Switzerland $ 23.0 $  $ 23.0 $ 12.2 $  $ 12.2 Other EMEA 47.5 10.1 57.6 27.9 5.4 33.3 Total EMEA $ 70.5 $ 10.1 $ 80.6 $ 40.1 $ 5.4 $ 45.5 Total net revenue $ 272.8 $ 34.1 $ 306.9 $ 181.3 $ 24.1 $ 205.4 Six Months Ended December 29, 2018 December 30, 2017 Product Revenue Service Revenue Total Product Revenue Service Revenue Total Americas: United States $ 149.9 $ 27.0 $ 176.9 $ 141.1 $ 26.8 $ 167.9 Other Americas 35.2 7.1 42.3 32.1 8.6 40.7 Total Americas $ 185.1 $ 34.1 $ 219.2 $ 173.2 $ 35.4 $ 208.6 Asia-Pacific: Greater China $ 123.5 $ 2.3 $ 125.8 $ 51.1 $ 1.0 $ 52.1 Other Asia 66.4 7.1 73.5 29.0 2.0 31.0 Total Asia-Pacific $ 189.9 $ 9.4 $ 199.3 $ 80.1 $ 3.0 $ 83.1 EMEA: Switzerland $ 48.7 $  $ 48.7 $ 40.5 $  $ 40.5 Other EMEA 90.2 18.0 108.2 52.6 11.5 64.1 Total EMEA $ 138.9 $ 18.0 $ 156.9 $ 93.1 $ 11.5 $ 104.6 Total net revenue $ 513.9 $ 61.5 $ 575.4 $ 346.4 $ 49.9 $ 396.3