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Net Loss Per Share (Summary of Calculation of Basic and Diluted Net Loss Per Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Numerator:
Allocation of distributed net loss attributable to common stockholders									$ (418,258)	$ (321,222)	$ (384,699)
Denominator:
Weighted-average common shares outstanding (in shares)									216,789	207,774	198,214
Basic and diluted net loss per share (dollars per share)	$ (0.47)	$ (0.70)	$ (0.40)	$ (0.35)	$ (0.42)	$ (0.41)	$ (0.40)	$ (0.31)	$ (1.93)	$ (1.55)	$ (1.94)
Class A Common Stock
Numerator:
Allocation of distributed net loss attributable to common stockholders									$ (287,021)	$ (208,159)	$ (236,946)
Denominator:
Weighted-average common shares outstanding (in shares)									148,767	134,642	122,085
Basic and diluted net loss per share (dollars per share)									$ (1.93)	$ (1.55)	$ (1.94)
Class B Common Stock
Numerator:
Allocation of distributed net loss attributable to common stockholders									$ (131,237)	$ (113,063)	$ (147,753)
Denominator:
Weighted-average common shares outstanding (in shares)									68,022	73,132	76,129
Basic and diluted net loss per share (dollars per share)									$ (1.93)	$ (1.55)	$ (1.94)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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