Summary of Business and Significant Accounting Policies - Additional Information (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2021 USD ($) vote	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)
Summary Of Business And Significant Accounting Policies [Line Items]
Restricted cash from international employee stock sales	$ 50,475	$ 48,547
Capitalized software development costs	19,400	3,100	$ 2,500
Advertising expense	$ 34,800	$ 42,000	$ 36,100
Number of operating segments | vote	1
Revenue from Contract with Customer | Professional Services Fees Concentration Risk
Summary Of Business And Significant Accounting Policies [Line Items]
Percentage of revenue	2.00%
Minimum
Summary Of Business And Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Maximum
Summary Of Business And Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Leasehold Improvements | Maximum
Summary Of Business And Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Software
Summary Of Business And Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years