Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended
	Apr. 30, 2018 USD ($) shares	Jul. 31, 2018 class $ / shares shares	Apr. 04, 2018 $ / shares	Jan. 31, 2018 $ / shares shares	[1]
Class Of Stock [Line Items]
Preferred stock, shares authorized (in shares)		20,000,000		20,000,000
Preferred stock, shares issued (in shares)		0		0
Preferred stock, shares outstanding (in shares)		0		0
Number of classes of stock | class		2
Common stock, shares authorized (in shares)		2,250,000,000		2,250,000,000
Common stock, par value per share (in dollars per share) | $ / shares		$ 0.0001		$ 0.0001
Common stock, shares issued (in shares)		235,412,000		220,979,000
Common stock, shares outstanding (in shares)		235,412,000		220,979,000
Closing price of stock (in dollars per share) | $ / shares		$ 21.66
Class A
Class Of Stock [Line Items]
Common stock, shares authorized (in shares)		2,000,000,000		2,000,000,000
Common stock, par value per share (in dollars per share) | $ / shares		$ 0.0001		$ 0.0001
Common stock, shares issued (in shares)		204,051,868		129,502,000
Common stock, shares outstanding (in shares)		204,051,868		129,502,000
Stock repurchased and retired during period (in shares)	1,008,573
Stock repurchased and retired during period, value | $	$ 20.0
Closing price of stock (in dollars per share) | $ / shares		$ 21.66	$ 19.83
Class B
Class Of Stock [Line Items]
Common stock, shares authorized (in shares)		250,000,000		250,000,000
Common stock, par value per share (in dollars per share) | $ / shares		$ 0.0001		$ 0.0001
Common stock, shares issued (in shares)		31,359,938		91,477,000
Common stock, shares outstanding (in shares)		31,359,938		91,477,000

[1] *Prior period information has been adjusted to reflect the adoption impact of Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606), which we adopted on February 1, 2018.