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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		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Denominator:
Weighted-average common shares outstanding (in shares)	226,392	215,932	224,857	214,517
Basic and diluted net loss per share (in dollars per share)	$ (0.53)	$ (0.40)	$ (1.05)	$ (0.75)
Class A
Numerator:
Allocation of distributed net loss	$ (86,481)	$ (58,776)	$ (169,067)	$ (108,888)
Denominator:
Weighted-average common shares outstanding (in shares)	162,193	147,310	160,414	145,475
Basic and diluted net loss per share (in dollars per share)	$ (0.53)	$ (0.40)	$ (1.05)	$ (0.75)
Class B
Numerator:
Allocation of distributed net loss	$ (34,231)	$ (27,380)	$ (67,920)	$ (51,678)
Denominator:
Weighted-average common shares outstanding (in shares)	64,199	68,622	64,443	69,042
Basic and diluted net loss per share (in dollars per share)	$ (0.53)	$ (0.40)	$ (1.05)	$ (0.75)

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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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