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Goodwill and Intangible Assets - Amortization Expense Related to Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014
Finite Lived Intangible Assets Amortization Expense [Line Items] |  |  |  |
Amortization expense of intangible assets | $ 33,214 us-gaap_AmortizationOfIntangibleAssets |  | $ 28,995 us-gaap_AmortizationOfIntangibleAssets |
Core/developed technology |  |  |  |
Finite Lived Intangible Assets Amortization Expense [Line Items] |  |  |  |
Amortization expense of intangible assets | 18,009 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = snps_DevelopedAndCoreTechnologyMember |  | 15,621 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = snps_DevelopedAndCoreTechnologyMember |
Customer relationships |  |  |  |
Finite Lived Intangible Assets Amortization Expense [Line Items] |  |  |  |
Amortization expense of intangible assets | 5,748 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 5,053 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Contract rights intangible |  |  |  |
Finite Lived Intangible Assets Amortization Expense [Line Items] |  |  |  |
Amortization expense of intangible assets | 7,852 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractualRightsMember |  | 7,126 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractualRightsMember |
Covenants not to compete |  |  |  |
Finite Lived Intangible Assets Amortization Expense [Line Items] |  |  |  |
Amortization expense of intangible assets | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = snps_CovenantsNotToCompeteMember |  | 17 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = snps_CovenantsNotToCompeteMember |
Trademarks and trade names |  |  |  |
Finite Lived Intangible Assets Amortization Expense [Line Items] |  |  |  |
Amortization expense of intangible assets | 699 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |  | 314 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |
Capitalized software development costs |  |  |  |
Finite Lived Intangible Assets Amortization Expense [Line Items] |  |  |  |
Amortization expense of intangible assets | $ 906 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = snps_CapitalizedSoftwareDevelopmentCostsMember | [1] | $ 864 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = snps_CapitalizedSoftwareDevelopmentCostsMember | [1]
[1] | Amortization of capitalized software development costs is included in cost of license revenue in the unaudited condensed consolidated statements of operations.

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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