Net Income Per Share Attributable to Common Stockholders - Narrative (Details) - USD ($)			12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Issuance of common stock reserved for charitable donation (in shares)	405,156	500,000	165,336	1,929,417	0
Convertible Promissory Notes
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument term					3 years
Convertible Promissory Notes | Dropbox
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument face amount					$ 5,000,000.0
Interest rate percentage					2.75%
Convertible Promissory Notes | Atlassian
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt instrument face amount					$ 10,000,000.0
Interest rate percentage					5.00%