Operating Leases - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Oct. 31, 2017 ft²
Leases [Abstract]
Operating lease, description			The Company leases its headquarters located in Sunnyvale, California, as well as office and data center space in various locations under non-cancelable operating lease agreements, with expiration dates between calendar years 2019 and 2023.
Operating lease, expiration date beginning period			2019
Operating lease, expiration date ending period			2023
Leases not yet commenced, description			As of July 31, 2019, the Company has no leases that have not yet commenced.
Lease rentable space of office building | ft²					33,400
Sublease cost | $	$ 0.3	$ 0.3	$ 0.6	$ 0.6