Common Stock (Details)	Jun. 14, 2019 Vote $ / shares shares	Jul. 31, 2019 $ / shares shares	Jan. 31, 2019 $ / shares shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares) | shares		0	220,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.0005	$ 0.0005
Preferred stock, shares authorized (in shares) | shares		100,000,000	0
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.0005	$ 0.0005
Class A common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares) | shares		2,000,000,000	0
Common stock, par value (in dollars per share) | $ / shares		$ 0.0005	$ 0.0005
Class B common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares) | shares		300,000,000	0
Common stock, par value (in dollars per share) | $ / shares		$ 0.0005	$ 0.0005
IPO
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares) | shares	100,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0005
IPO | Class A common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares) | shares	2,000,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0005
Number of votes per share | Vote	1
Common stock conversion ratio	1
IPO | Class B common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares) | shares	300,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0005
Number of votes per share | Vote	10
Common stock conversion ratio	1