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Acquisition-related Intangible Assets, Net | 3 Months Ended
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Apr. 30, 2019
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):
| April 30, 2019 |  | January 31, 2019
Developed technology | $ | 186,800 |  |  | $ | 186,800 |
Customer relationships | 189,000 |  |  | 189,000 |
Trade name | 12,000 |  |  | 12,000 |
Backlog | 11,000 |  |  | 11,000 |
Acquisition-related intangible assets, gross | 398,800 |  |  | 398,800 |
Less accumulated amortization | (104,903 | ) |  | (85,560 | )
Acquisition-related intangible assets, net | $ | 293,897 |  |  | $ | 313,240 |
Amortization expense related to acquisition-related intangible assets was $19 million and $5 million for the three months ended April 30, 2019 and 2018, respectively. As of April 30, 2019, our future estimated amortization expense related to acquisition-related intangible assets is as follows (in thousands):
Fiscal period: |
Remainder of 2020 | $ | 49,513 |
2021 | 48,142 |
2022 | 43,733 |
2023 | 41,009 |
2024 | 29,833 |
Thereafter | 81,667 |
Total | $ | 293,897 |

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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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