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Goodwill and Intangible Assets, net Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018 | Mar. 18, 2019
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 48,023,000 | $ 18,089,000 | [1] |  |  |
Goodwill impairments | 0 | 0 |  | $ 0 |  |
Stock-based compensation included in capitalized software costs | 1,200,000 | 500,000 |  |  |  |
Amortization expense | 10,600,000 | 5,800,000 |  | 2,900,000 |  |
Company wrote-off an immaterial amount | 119,000 | $ 0 | [2] | 1,114,000 | [2] |
Purchased developed technology | $ 24,200,000 |  |  |  |  |
Weighted average useful life | 3 years 10 months 24 days | 2 years 6 months |  |  |  |
Capitalized internal-use software costs |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Capitalized internal-use software | $ 5,100,000 | $ 3,400,000 |  |  |  |
Amortization expense | 4,900,000 | 4,800,000 |  | $ 2,700,000 |  |
Company wrote-off an immaterial amount | 119,000 | 0 |  |  |  |
Purchased developed technology |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Company wrote-off an immaterial amount | 0 | $ 0 |  |  |  |
Finite-lived Intangible Assets Acquired | 8,500,000 |  |  |  |  |
Azuqua, Inc. |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 29,900,000
Goodwill recorded in connection with Azuqua acquisition | 29,934,000 |  |  |  |  |
Purchased developed technology | $ 15,700,000 |  |  |  |  |
Azuqua, Inc. | Purchased developed technology |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Purchased developed technology |  |  |  |  |  | $ 15,700,000
[1] | Adjusted for adoption of ASC 842. See Note 2.
[2] | Adjusted for adoption of ASC 842. See Note 2.

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