Balance Sheet Components - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Property Plant And Equipment [Line Items]
Allowance for doubtful accounts receivable	$ 2.7		$ 2.7		$ 2.7
Accumulated depreciation of property and equipment acquired under finance lease	184.9		184.9		152.5
Depreciation expense	16.3	$ 17.5	48.7	$ 51.1
Servers and related equipment
Property Plant And Equipment [Line Items]
Gross amount of property and equipment acquired under finance lease	258.5		258.5		256.0
Depreciation expense	$ 13.4	$ 14.1	$ 39.5	$ 41.0
Construction in progress
Property Plant And Equipment [Line Items]
Gross amount of property and equipment acquired under finance lease					$ 7.1