Redeemable Convertible Preferred Stock (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($) shares	Oct. 31, 2020 USD ($) $ / shares shares	Oct. 31, 2020 USD ($) $ / shares shares	Oct. 31, 2021 shares	Jul. 31, 2021 shares	Jan. 31, 2021 shares	Jul. 31, 2020 shares	Jan. 31, 2020 shares
Temporary Equity [Line Items]
Issuance of redeemable convertible preferred stock (in shares)			12,349,827
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)		182,271,099	182,271,099
Conversion of redeemable convertible preferred stock to common stock upon initial public offering | $		$ 1,415,047	$ 1,415,047
Reclassification of converted shares | $		$ 1,415,047	$ 1,415,047
Redeemable convertible preferred stock, shares outstanding (in shares)		0	0	0	0	0	182,271,099	169,921,272
Redeemable convertible preferred stock, shares issued (in shares)				0		0
Series G-1 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Issuance of redeemable convertible preferred stock (in shares)			8,480,857
Redemption price (in dollars per share) | $ / shares		$ 38.77	$ 38.77
Series G-2 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Issuance of redeemable convertible preferred stock (in shares)			3,868,970
Redemption price (in dollars per share) | $ / shares		$ 38.77	$ 38.77
Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	182,271,099
Reclassification of converted shares | $	$ 1,400,000
Class B Common Stock
Temporary Equity [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	182,271,099
Conversion ratio	1
Conversion of redeemable convertible preferred stock to common stock upon initial public offering | $	$ 1,400,000