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v3.20.1

Revenues - Additional Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) Country | Jan. 31, 2020 USD ($)
Revenue from Contract with Customer [Line Items] |  |  |
Deferred revenue | $ 368.3 |  | $ 423.8
Deferred revenue, revenue recognized out of beginning balance | 154.4 | $ 134.4 |
Remaining performance obligation, revenue expected to be recognized | $ 722.7 |  |
Revenue remaining performance obligation, percentage | 65.00% |  |
Customer Concentration Risk | Revenue |  |  |
Revenue from Contract with Customer [Line Items] |  |  |
Concentration risk percentage | 10.00% | 10.00% |
Customer Concentration Risk | United States | Revenue |  |  |
Revenue from Contract with Customer [Line Items] |  |  |
Concentration risk percentage | 73.00% | 76.00% |
Customer Concentration Risk | Japan | Revenue |  |  |
Revenue from Contract with Customer [Line Items] |  |  |
Concentration risk percentage | 13.00% |  |
Customer Concentration Risk | Outside United States | Revenue |  |  |
Revenue from Contract with Customer [Line Items] |  |  |
Number of countries outside domestic that contributes more than concentration threshold | Country |  | 0 |

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