Goodwill and Acquired Intangible Assets, Net - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2021	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 57,775		$ 57,775		$ 55,830
Amortization of intangible assets		$ 2,300	$ 2,100	$ 4,500	$ 4,300
2021 Acquisition
Acquired Finite-Lived Intangible Assets [Line Items]
Cash consideration for aquisition	$ 9,000
Business acquisition, purchase price	4,500
Post-combination compensation expense	4,500
Goodwill	1,900
Other tax expense (benefit)	800
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life				3 years 1 month 6 days		3 years 3 months 18 days
Developed technology | 2021 Acquisition
Acquired Finite-Lived Intangible Assets [Line Items]
Business acquisition, finite-lived intangibles	$ 3,400
Finite-lived intangible asset, useful life	5 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life				2 years 3 months 18 days		2 years 9 months 18 days