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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill | Goodwill:
| (in thousands)
Balance at October 31, 2016 | $ | 2,518,245 |
Additions | 178,545 |
Effect of foreign currency translation | 10,184 |
Balance at October 31, 2017 | $ | 2,706,974 |
Additions | 443,007 |
Effect of foreign currency translation | (6,732 | )
Balance at October 31, 2018(1) | $ | 3,143,249 |
(1) | There is no impairment of goodwill for periods presented.
Summary of Intangible Assets | Intangible assets as of October 31, 2018 consist of the following:
| Gross Assets |  | Accumulated Amortization |  | Net Assets
| (in thousands)
Core/developed technology | $ | 773,147 |  |  | $ | 598,956 |  |  | $ | 174,191 |
Customer relationships | 358,524 |  |  | 204,382 |  |  | 154,142 |
Contract rights intangible | 183,953 |  |  | 177,191 |  |  | 6,762 |
Trademarks and trade names | 42,929 |  |  | 21,944 |  |  | 20,985 |
In-process research and development (IPR&D)(2) | 1,200 |  |  | — |  |  | 1,200 |
Capitalized software development costs | 35,818 |  |  | 32,694 |  |  | 3,124 |
Total | $ | 1,395,571 |  |  | $ | 1,035,167 |  |  | $ | 360,404 |
(2) | IPR&D is reclassified to core/developed technology upon completion or is written off upon abandonment.
Intangible assets as of October 31, 2017 consist of the following:
| Gross Assets |  | Accumulated Amortization |  | Net Assets
| (in thousands)
Core/developed technology | $ | 647,975 |  |  | $ | 526,796 |  |  | $ | 121,179 |
Customer relationships | 278,811 |  |  | 166,886 |  |  | 111,925 |
Contract rights intangible | 174,615 |  |  | 172,178 |  |  | 2,437 |
Trademarks and trade names | 25,329 |  |  | 17,401 |  |  | 7,928 |
In-process research and development (IPR&D)(2) | 6,600 |  |  | — |  |  | 6,600 |
Capitalized software development costs | 32,868 |  |  | 29,094 |  |  | 3,774 |
Total | $ | 1,166,198 |  |  | $ | 912,355 |  |  | $ | 253,843 |
Amortization Expense Related to Intangible Assets | Amortization expense related to intangible assets consisted of the following:
| Year Ended October 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Core/developed technology | $ | 78,820 |  |  | $ | 65,916 |  |  | $ | 85,331 |
Customer relationships | 37,395 |  |  | 27,340 |  |  | 24,594 |
Contract rights intangible | 4,906 |  |  | 10,886 |  |  | 16,543 |
Trademarks and trade names | 4,543 |  |  | 3,580 |  |  | 3,156 |
Capitalized software development costs(3) | 3,599 |  |  | 3,986 |  |  | 3,697 |
Total | $ | 129,263 |  |  | $ | 111,708 |  |  | $ | 133,321 |
(3) | Amortization of capitalized software development costs is included in cost of products revenue in the consolidated statements of operations.
Estimated Future Amortization of Intangible Assets | The following table presents the estimated future amortization of intangible assets:
Fiscal Year | (in thousands)
2019 | $ | 102,605 |
2020 | 78,074 |
2021 | 55,850 |
2022 | 44,009 |
2023 | 29,219 |
2024 and thereafter | 49,447 |
IPR&D(4) | 1,200 |
Total | $ | 360,404 |
(4) | IPR&D assets are amortized over their useful lives upon completion or are written off upon abandonment.

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