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Marketable Securities - Summary of Cash Equivalents and Marketable Securities (Details) (USD $)	Apr. 30, 2015	Jan. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 125,681,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Unrealized Gain	16,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Unrealized Loss	(13,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Marketable securities	125,684,000us-gaap_AvailableForSaleSecurities	0us-gaap_AvailableForSaleSecurities
Corporate Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	62,496,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember
Unrealized Gain	10,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember
Unrealized Loss	(1,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember
Marketable securities	62,505,000us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember
U.S. Government Agency Obligations
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	20,295,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Unrealized Gain	1,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Unrealized Loss	(1,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Marketable securities	20,295,000us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	15,518,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Gain	4,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Loss	(7,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Marketable securities	15,515,000us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	15,335,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember
Unrealized Gain	1,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember
Unrealized Loss	(2,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember
Marketable securities	15,334,000us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember
U.S. Government Obligations
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	12,037,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Unrealized Loss	(2,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Marketable securities	12,035,000us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Included in Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	21,692,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_CashAndCashEquivalentsMember
Unrealized Gain	3,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_CashAndCashEquivalentsMember
Marketable securities	21,695,000us-gaap_AvailableForSaleSecurities / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_CashAndCashEquivalentsMember
Included in Marketable Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	103,989,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized Gain	13,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized Loss	(13,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember
Marketable securities	$ 103,989,000us-gaap_AvailableForSaleSecurities / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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