Stockholders' Equity - Narrative (Details)	1 Months Ended
	Apr. 30, 2018 USD ($) shares	Aug. 31, 2019 USD ($)	Jul. 31, 2019 class $ / shares shares	Jan. 31, 2019 $ / shares shares	Apr. 04, 2018 $ / shares
Equity [Abstract]
Shares authorized (in shares)			20,000,000	20,000,000
Number of classes of stock | class			2
Class of Stock [Line Items]
Shares authorized (in shares)			2,250,000,000	2,250,000,000
Par value per share (in dollars per share) | $ / shares			$ 0.0001	$ 0.0001
Shares issued (in shares)			241,359,000	220,979,000
Closing price of stock (in dollars per share) | $ / shares			$ 15.14
Class A
Class of Stock [Line Items]
Shares authorized (in shares)			2,000,000,000	2,000,000,000
Par value per share (in dollars per share) | $ / shares			$ 0.0001	$ 0.0001
Shares issued (in shares)			255,751,711	243,524,000
Stock repurchased and retired (in shares)	1,008,573
Stock repurchased and retired during period, value | $	$ 20,000,000.0
Closing price of stock (in dollars per share) | $ / shares			$ 15.14		$ 19.83
Class B
Class of Stock [Line Items]
Shares authorized (in shares)			250,000,000	250,000,000
Par value per share (in dollars per share) | $ / shares			$ 0.0001	$ 0.0001
Shares issued (in shares)			0	0
Subsequent Event | Class A
Class of Stock [Line Items]
Value Approved For Repurchase | $		$ 150,000,000.0