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Goodwill and Intangible Assets, net Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018 | [1]
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross | $ 54,802 | $ 25,461 |  |
Accumulated Amortization | (22,154) | (11,564) |  |
Write-offs | (119) | 0 | [1] | $ (1,114)
Net | 32,529 | 13,897 |  |
Capitalized internal-use software costs |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross | 24,890 | 19,838 |  |
Accumulated Amortization | (14,828) | (9,969) |  |
Write-offs | (119) | 0 |  |
Net | 9,943 | 9,869 |  |
Purchased developed technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross | 28,800 | 4,600 |  |
Accumulated Amortization | (6,321) | (833) |  |
Write-offs | 0 | 0 |  |
Net | 22,479 | 3,767 |  |
Software licenses |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross | 1,112 | 1,023 |  |
Accumulated Amortization | (1,005) | (762) |  |
Write-offs | 0 | 0 |  |
Net | $ 107 | $ 261 |  |
[1] | Adjusted for adoption of ASC 842. See Note 2.

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