Equity Incentive Plans and Stock-Based Compensation - Restricted Stock Unit Activity (Details) - RSUs shares in Thousands	12 Months Ended
	Jan. 31, 2022 $ / shares shares
RSUs (in thousands)
Unvested, beginning balance (in shares) | shares	34,753
Granted (in shares) | shares	19,695
Vested (in shares) | shares	(25,283)
Forfeited (in shares) | shares	(1,650)
Unvested, ending balance (in shares) | shares	27,515
Weighted-Average Grant Date Fair Value Per Share
Unvested, beginning balance (in dollars per share) | $ / shares	$ 10.80
Granted (in dollars per share) | $ / shares	45.09
Vested (in dollars per share) | $ / shares	9.98
Forfeited (in dollars per share) | $ / shares	24.82
Unvested, ending balance (in dollars per share) | $ / shares	$ 35.35