Derivative Instruments, Gain (Loss) Related to Discontinuing of Cash Flow Hedge

No definition available.

Name:	snps_DerivativeInstrumentsGainLossRelatedToDiscontinuingOfCashFlowHedge
Namespace Prefix:	snps_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Derivative, Maximum Shipment Period For Entry Into Foreign Currency Forward Contract

+ References

No definition available.

+ Details

Name:	snps_DerivativeMaximumShipmentPeriodForEntryIntoForeignCurrencyForwardContract
Namespace Prefix:	snps_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Financial Assets and Liabilities [Line Items]

+ References

No definition available.

+ Details

Name:	snps_FinancialAssetsAndLiabilitiesLineItems
Namespace Prefix:	snps_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Impairment of Non-Marketable Equity Securities

+ References

No definition available.

+ Details

Name:	snps_ImpairmentOfNonMarketableEquitySecurities
Namespace Prefix:	snps_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Short-Term Investments, Term

+ References

No definition available.

+ Details

Name:	snps_ShortTermInvestmentsTerm
Namespace Prefix:	snps_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Estimated period for the anticipated transfer of gain (loss), net, from accumulated other comprehensive income into earnings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimateOfTimeToTransfer1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeRemainingMaturity1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

Name:	us-gaap_LinesOfCreditCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-SubTopic 30
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480870/815-30-50-1

+ Details

Name:	us-gaap_MaximumLengthOfTimeForeignCurrencyCashFlowHedge
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=snps_SeniorRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=snps_FifthAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=snps_UncommittedIncrementalLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=snps_TheCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ForeignLineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financial Assets and Liabilities - Additional Information (Detail) ¥ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2018 USD ($)	Oct. 31, 2023 USD ($)	Oct. 31, 2022 USD ($)	Oct. 31, 2021 USD ($)	Dec. 14, 2022 USD ($)	Jan. 22, 2021 USD ($)	Jul. 31, 2018 CNY (¥)
Financial Assets And Liabilities [Line Items]
Impairment of non-marketable equity securities		$ 0	$ 0	$ 0
Shipments period using hedges (in months)		1 month
Period for hedge balance in OCI to be reclassified to statement of operations (in months)		12 months
Gain (loss) related to discontinuing of cash flow hedge		$ 0	0	$ 0
Maximum
Financial Assets And Liabilities [Line Items]
Short-term investments, term		3 years
Fair values of derivative instruments not designated as hedging instruments
Financial Assets And Liabilities [Line Items]
Forward contracts terms (in months)		1 month
Foreign currency derivative contracts \| Minimum
Financial Assets And Liabilities [Line Items]
Derivative maturity period		1 month
Foreign currency derivative contracts \| Maximum
Financial Assets And Liabilities [Line Items]
Derivative maturity period		27 months
Foreign currency derivative contracts \| Cash Flow Hedging \| Maximum
Financial Assets And Liabilities [Line Items]
Derivative maturity period		3 years
Foreign Exchange Forward \| Cash Flow Hedging \| Maximum
Financial Assets And Liabilities [Line Items]
Derivative maturity period		27 months
Foreign Exchange Contracts \| Maximum
Financial Assets And Liabilities [Line Items]
Non-designated foreign exchange forward contract remaining maturity		1 year
Unsecured Debt \| Senior Revolving Credit Facility \| Fifth Amendment
Financial Assets And Liabilities [Line Items]
Credit facility maximum borrowing capacity					$ 850,000,000	$ 650,000,000
Unsecured Debt \| Uncommitted Incremental Loan Facility \| Fifth Amendment
Financial Assets And Liabilities [Line Items]
Credit facility maximum borrowing capacity					$ 150,000,000
Unsecured Debt \| Revolving Credit Facility \| The Credit Agreement
Financial Assets And Liabilities [Line Items]
Line of credit, current		$ 0	$ 0
Unsecured Debt \| Revolving Credit Facility \| The Credit Agreement \| Minimum
Financial Assets And Liabilities [Line Items]
Commitment fees percentage		0.09%
Unsecured Debt \| Revolving Credit Facility \| The Credit Agreement \| Maximum
Financial Assets And Liabilities [Line Items]
Commitment fees percentage		0.15%
Foreign Line of Credit
Financial Assets And Liabilities [Line Items]
Credit facility maximum borrowing capacity	$ 33,000,000						¥ 220.0
Line of credit, current		$ 18,100,000
Debt instrument, term	12 years
Prime Rate \| Foreign Line of Credit
Financial Assets And Liabilities [Line Items]
Borrowings, interest rate		0.74%
Debt instrument, term		5 years
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Unsecured Debt \| Revolving Credit Facility \| The Credit Agreement \| Minimum
Financial Assets And Liabilities [Line Items]
Borrowings, interest rate		0.785%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Unsecured Debt \| Revolving Credit Facility \| The Credit Agreement \| Maximum
Financial Assets And Liabilities [Line Items]
Borrowings, interest rate		0.975%