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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2015		Apr. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (47,283)us-gaap_NetIncomeLoss		$ (38,511)us-gaap_NetIncomeLoss
Other comprehensive income (loss)*:
Changes in foreign currency translation adjustment	(7)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	[1]	2us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	[1]
Net change in unrealized gains on available-for-sale investments	2us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Other comprehensive income (loss)	(5)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent		2us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive loss	$ (47,288)us-gaap_ComprehensiveIncomeNetOfTax		$ (38,509)us-gaap_ComprehensiveIncomeNetOfTax
[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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