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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		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Denominator:
Weighted-average common shares outstanding (in shares)	217,694	209,188	215,588	206,715
Basic and diluted net loss per share (in dollars per share)	$ (0.70)	$ (0.41)	$ (1.46)	$ (1.12)
Class A
Numerator:
Allocation of distributed net loss	$ (105,549)	$ (55,592)	$ (213,961)	$ (149,179)
Denominator:
Weighted-average common shares outstanding (in shares)	149,855	135,941	146,951	132,851
Basic and diluted net loss per share (in dollars per share)	$ (0.70)	$ (0.41)	$ (1.46)	$ (1.12)
Class B
Numerator:
Allocation of distributed net loss	$ (47,782)	$ (29,954)	$ (99,936)	$ (82,943)
Denominator:
Weighted-average common shares outstanding (in shares)	67,839	73,247	68,637	73,864
Basic and diluted net loss per share (in dollars per share)	$ (0.70)	$ (0.41)	$ (1.46)	$ (1.12)

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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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