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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (116,275)	$ (74,410)
Other comprehensive income (loss), net of tax:
Net change in foreign currency translation adjustment	(646)	(787)
Net change in unrealized gains (losses) on available-for-sale debt securities, net of tax provision of $219 and $0, respectively	703	(533)
Net change in market value of effective foreign currency forward exchange contracts, net of tax provision of $1,981 and $2,424, respectively	13,865
Net change in market value of effective foreign currency forward exchange contracts, net of tax provision of $1,981 and $2,424, respectively		16,967
Other comprehensive income (loss), net of tax	13,922	15,647
Comprehensive loss	$ (102,353)	$ (58,763)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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