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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (120,712)	$ (86,156)	$ (236,987)	$ (160,566)
Other comprehensive income (loss), net of tax:
Net change in foreign currency translation adjustment	53	(474)	(593)	(1,261)
Net change in unrealized gains (losses) on available-for-sale debt securities, net of tax provision of $212, $284, $431, and $284, respectively	889	1,439	1,592	906
Net change in market value of effective foreign currency forward exchange contracts, net of tax provision of $2,629, $2,481, $4,610, and $4,905, respectively	18,403		32,268
Net change in market value of effective foreign currency forward exchange contracts, net of tax provision of $2,629, $2,481, $4,610, and $4,905, respectively		17,370		34,337
Other comprehensive income (loss), net of tax	19,345	18,335	33,267	33,982
Comprehensive loss	$ (101,367)	$ (67,821)	$ (203,720)	$ (126,584)

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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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