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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (153,331)	$ (85,546)	$ (313,897)	$ (232,122)
Other comprehensive income (loss), net of tax:
Net change in foreign currency translation adjustment	(551)	(504)	(1,812)	462
Net change in unrealized gains (losses) on available-for-sale debt securities, net of tax provision of $10, $0, $294, and $0, respectively	375	(302)	1,281	(931)
Net change in market value of effective foreign currency forward exchange contracts, net of tax provision of $2,339, $0, $7,244, and $0, respectively	16,375	6,693	50,712	(17,912)
Other comprehensive income (loss), net of tax	16,199	5,887	50,181	(18,381)
Comprehensive loss	$ (137,132)	$ (79,659)	$ (263,716)	$ (250,503)

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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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