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Acquisition-Related Intangible Assets, Net | 9 Months Ended
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Oct. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Acquisition-Related Intangible Assets, Net | Acquisition-Related Intangible Assets, Net Acquisition-related intangible assets, net consisted of the following (in thousands):
| October 31, 2021 |  | January 31, 2021
Developed technology | $ | 319,300 |  |  | $ | 218,400 |
Customer relationships | 298,100 |  |  | 223,000 |
Trade name | 12,500 |  |  | 12,000 |
Backlog | 15,000 |  |  | 11,000 |
Acquisition-related intangible assets, gross | 644,900 |  |  | 464,400 |
Less accumulated amortization | (273,242) |  |  | (215,774) |
Acquisition-related intangible assets, net | $ | 371,658 |  |  | $ | 248,626 |
Amortization expense related to acquisition-related intangible assets was $19 million and $14 million for the three months ended October 31, 2021, and 2020, respectively, and $57 million and $46 million for the nine months ended October 31, 2021, and 2020, respectively. As of October 31, 2021, our future estimated amortization expense related to acquisition-related intangible assets was as follows (in thousands):
Fiscal Period: |
Remainder of 2022 | $ | 20,011 |
2023 | 77,786 |
2024 | 66,569 |
2025 | 53,913 |
2026 | 48,560 |
Thereafter | 104,819 |
Total | $ | 371,658 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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