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Financial Assets and Liabilities - Short-term investments (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2015
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Cash equivalents |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | $ 397,945 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross unrealized gains | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross unrealized losses less than 12 months | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Estimated fair value | 397,945 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember | [1]
Cash equivalents | Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 394,546 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross unrealized gains | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross unrealized losses less than 12 months | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Estimated fair value | 394,546 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember | [1]
Cash equivalents | Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 3,399 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross unrealized gains | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross unrealized losses less than 12 months | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |
Estimated fair value | 3,399 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember | [1]
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 136,549 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized gains | 43 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses less than 12 months | (13)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Estimated fair value | 136,579 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | [1]
Short-term investments | Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 5,950 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized gains | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses less than 12 months | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Estimated fair value | 5,950 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | [1]
Short-term investments | Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 5,893 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized gains | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses less than 12 months | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Estimated fair value | 5,893 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | [1]
Short-term investments | U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 24,907 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized gains | 6 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses less than 12 months | (1)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Estimated fair value | 24,912 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | [1]
Short-term investments | Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 1,404 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MunicipalBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized gains | 2 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MunicipalBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses less than 12 months | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MunicipalBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MunicipalBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Estimated fair value | 1,406 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MunicipalBondsMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | [1]
Short-term investments | Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 67,829 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized gains | 25 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses less than 12 months | (9)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Estimated fair value | 67,845 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | [1]
Short-term investments | Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 30,566 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized gains | 10 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses less than 12 months | (3)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Gross unrealized losses 12 months or longer | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember |
Estimated fair value | $ 30,573 us-gaap_AvailableForSaleSecurities / us-gaap_CashAndCashEquivalentsAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | [1]
[1] | See Note 5. Fair Value Measures for further discussion on fair values of cash equivalents and short-term investments.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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