Stockholders' Equity - Additional Information (Details) - $ / shares	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015
Class Of Stock [Line Items]
Preferred stock, shares authorized	20,000,000	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	2,250,000,000	2,250,000,000
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares issued	194,124,000	190,509,000
Common stock, shares outstanding	194,124,000	190,509,000
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares issued	66,438,448	28,769,000
Common stock, shares outstanding	66,438,448	28,769,000
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	250,000,000	250,000,000
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares issued	127,685,960	161,740,000
Common stock, shares outstanding	127,685,960	161,740,000