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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (39,285)	$ (38,102)	$ (79,371)	$ (76,677)
Other comprehensive income (loss):
Changes in foreign currency translation adjustment	[1]	149	(49)	178	65
Net change in unrealized gain on available-for-sale investments	[1]		1		3
Other comprehensive income (loss):	[1]	149	(48)	178	68
Comprehensive loss		$ (39,136)	$ (38,150)	$ (79,193)	$ (76,609)
[1] Tax effect was not material

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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, attributable to parent entity.

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

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