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

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