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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Oct. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill | Goodwill:
| (in thousands)
Balance at October 31, 2015 | $ | 2,471,241 |
Additions | 39,172 |
Adjustments | 435 |
Effect of foreign currency translation | 7,397 |
Balance at October 31, 2016 | $ | 2,518,245 |
Additions | 178,545 |
Effect of foreign currency translation | 10,184 |
Balance at October 31, 2017(1) | $ | 2,706,974 |
(1) | There is no impairment of goodwill for periods presented.
Summary of Intangible Assets | 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 |
(2) | IPR&D is reclassified to core/developed technology upon completion or is written off upon abandonment.
Intangible assets as of October 31, 2016 consist of the following:
| Gross Assets |  | Accumulated Amortization |  | Net Assets
| (in thousands)
Core/developed technology | $ | 610,812 |  |  | $ | 460,722 |  |  | $ | 150,090 |
Customer relationships | 235,997 |  |  | 139,932 |  |  | 96,065 |
Contract rights intangible | 171,248 |  |  | 162,183 |  |  | 9,065 |
Trademarks and trade names | 20,729 |  |  | 13,821 |  |  | 6,908 |
Capitalized software development costs | 29,642 |  |  | 25,109 |  |  | 4,533 |
Total | $ | 1,068,428 |  |  | $ | 801,767 |  |  | $ | 266,661 |
Amortization Expense Related to Intangible Assets | Amortization expense related to intangible assets consisted of the following:
| Year Ended October 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Core/developed technology | $ | 65,916 |  |  | $ | 85,331 |  |  | $ | 76,674 |
Customer relationships | 27,340 |  |  | 24,594 |  |  | 23,104 |
Contract rights intangible | 10,886 |  |  | 16,543 |  |  | 33,350 |
Trademarks and trade names | 3,580 |  |  | 3,156 |  |  | 2,900 |
Capitalized software development costs(3) | 3,986 |  |  | 3,697 |  |  | 3,653 |
Total | $ | 111,708 |  |  | $ | 133,321 |  |  | $ | 139,681 |
(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)
2018 | $ | 88,907 |
2019 | 62,940 |
2020 | 44,938 |
2021 | 26,708 |
2022 | 16,648 |
2023 and thereafter | 7,102 |
IPR&D(4) | 6,600 |
Total | $ | 253,843 |
(4) | IPR&D assets are amortized over their useful lives upon completion or are written off upon abandonment.

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