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Liabilities and Restructuring Charges - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014 | Jan. 31, 2015
Restructuring Charges [Abstract] |  |  |  |  |
Restructuring charges | $ 0 us-gaap_RestructuringCharges | $ 0 us-gaap_RestructuringCharges | $ 15,336,000 us-gaap_RestructuringCharges | $ 0 us-gaap_RestructuringCharges |
Voluntary Retirement Program and Headcount Reduction Program [Member] |  |  |  |  |
Restructuring Charges [Abstract] |  |  |  |  |
Restructuring charges |  |  |  |  | 15,300,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = snps_VoluntaryRetirementProgramandHeadcountReductionProgramMember
Restructuring charges paid during period | 1,700,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = snps_VoluntaryRetirementProgramandHeadcountReductionProgramMember |  | 14,300,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = snps_VoluntaryRetirementProgramandHeadcountReductionProgramMember |  |
Payroll and related benefits liabilities | $ 1,000,000 us-gaap_OtherEmployeeRelatedLiabilitiesCurrent / us-gaap_RestructuringPlanAxis = snps_VoluntaryRetirementProgramandHeadcountReductionProgramMember |  | $ 1,000,000 us-gaap_OtherEmployeeRelatedLiabilitiesCurrent / us-gaap_RestructuringPlanAxis = snps_VoluntaryRetirementProgramandHeadcountReductionProgramMember |  |

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for employer-related costs not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Details
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