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Net Loss per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Numerator:
Net loss	$ (36,637)	$ (40,086)
Denominator:
Weighted-average number of shares outstanding— basic and diluted	138,524	131,469
Net loss per share—basic and diluted	$ (0.26)	$ (0.30)
Class A Common Stock
Numerator:
Net loss	$ (33,706)	$ (22,061)
Denominator:
Weighted-average number of shares outstanding— basic and diluted	127,444	72,352
Net loss per share—basic and diluted	$ (0.26)	$ (0.30)
Class B Common Stock
Numerator:
Net loss	$ (2,931)	$ (18,025)
Denominator:
Weighted-average number of shares outstanding— basic and diluted	11,080	59,117
Net loss per share—basic and diluted	$ (0.26)	$ (0.30)

X

- Definition

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.

+ References

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- Definition

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

+ References

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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