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Balance Sheet Components - Schedule of Other Long-Term Assets (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2021 | Jan. 31, 2020
Property Plant And Equipment [Line Items] |  |
Capitalized stock-based compensation expenses | $ 5.8 | $ 5.0
Accumulated amortization of capitalized software costs | 11.2 | 1.7
Amortization expense related to capitalized software | $ 9.5 | $ 1.7
Maximum |  |
Property Plant And Equipment [Line Items] |  |
Finite-lived intangible assets estimated useful lives | 7 years |
Minimum |  |
Property Plant And Equipment [Line Items] |  |
Finite-lived intangible assets estimated useful lives | 2 years |
On-premises software | Maximum |  |
Property Plant And Equipment [Line Items] |  |
Finite-lived intangible assets estimated useful lives | 4 years |
On-premises software | Minimum |  |
Property Plant And Equipment [Line Items] |  |
Finite-lived intangible assets estimated useful lives | 3 years |

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