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Revenues - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2019 USD ($) | Oct. 31, 2018 USD ($) Country | Oct. 31, 2019 USD ($) Country | Oct. 31, 2018 USD ($) Country | Jan. 31, 2019 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Deferred revenue | $ 325.6 |  | $ 325.6 |  | $ 375.0
Deferred revenue, revenue recognized out of beginning balance | 141.5 | $ 120.1 | 315.9 | $ 252.1 |
Remaining performance obligation, revenue expected to be recognized | $ 636.0 |  | $ 636.0 |  |
Revenue remaining performance obligation, percentage | 68.00% |  | 68.00% |  |
Customer Concentration Risk | Revenue |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Concentration risk percentage | 10.00% | 12.00% | 10.00% | 12.00% |
Customer Concentration Risk | United States | Revenue |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Concentration risk percentage | 75.00% | 75.00% | 75.00% | 76.00% |
Customer Concentration Risk | Japan | Revenue |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Concentration risk percentage | 10.00% |  |  |  |
Customer Concentration Risk | Outside United States | Revenue |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Number of countries outside domestic that contributes more than concentration threshold | Country |  | 0 | 0 | 0 |

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