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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (74,410)	$ (64,044)
Other comprehensive income (loss), net of tax:
Net change in foreign currency translation adjustment	(787)	(277)
Net change in unrealized gains (losses) on available-for-sale debt securities	(533)	(775)
Net change in market value of effective foreign currency forward exchange contracts, net of tax provision of $2,424 and $0, respectively	16,967	(1,209)
Other comprehensive income (loss), net of tax	15,647	(2,261)
Comprehensive loss	$ (58,763)	$ (66,305)

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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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-Section 45
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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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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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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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