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Stock-Based Compensation - Summary of Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | $ 154,292 | $ 145,988 | $ 119,296
Cost of Revenue |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 18,936 | 16,769 | 14,065
Research and Development |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 61,145 | 62,565 | 45,189
Sales and Marketing |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 42,015 | 38,030 | 36,864
General and Administrative |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | $ 32,196 | $ 28,624 | $ 23,178

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