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Net Loss per Share Attributable to Common Stockholders - Calculation of basic and diluted net loss per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Numerator:
Net loss	$ (45,722)	$ (270,687)
Less: preferred stock accretion	0	(353)
Net loss attributable to common stockholders	$ (45,722)	$ (271,040)
Denominator:
Weighted-average common shares outstanding (in shares)	172,101	36,334
Net loss per share attributable to common stockholders:
Basic and diluted (in usd per share)	$ (0.27)	$ (7.46)

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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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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