Revenues - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Deferred revenue	$ 465.6	$ 423.8
Deferred revenue, revenue recognized out of beginning balance	407.5	$ 353.6
Remaining performance obligation, revenue expected to be recognized	$ 896.9
Revenue remaining performance obligation, percentage	61.00%
Geographic Concentration Risk \| United States \| Revenue
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Concentration risk percentage	72.00%	75.00%	77.00%
Geographic Concentration Risk \| Japan \| Revenue
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Concentration risk percentage	14.00%	10.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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