Line Of Credit Facility, Maximum Borrowing Capacity, Increase (Decrease)

No definition available.

Name:	snps_LineOfCreditFacilityMaximumBorrowingCapacityIncreaseDecrease
Namespace Prefix:	snps_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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

The carrying value as of the balance sheet date of the current and noncurrent portions 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

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-Section S99
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+ Details

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

- 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
-Topic 210
-SubTopic 10
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-Section S99
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+ Details

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

Bridge Commitment Letter, Term Loan and Revolving Credit Facilities (Details) ¥ in Millions, $ in Millions				1 Months Ended
	Jun. 30, 2025	May 14, 2024	Feb. 13, 2024 USD ($)	Jul. 31, 2018 USD ($)	Oct. 31, 2024 USD ($)	Oct. 03, 2024 USD ($)	Oct. 31, 2023 USD ($)	Jul. 31, 2018 CNY (¥)
Foreign Line of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity				$ 33.0				¥ 220.0
Debt instrument, term				12 years
Amount outstanding					$ 15.6
Borrowings, interest rate				0.74%
Term Loan Agreement \| Line of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 4,300.0
Bridge Loan \| Bridge Commitment \| Line of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity					10,600.0	$ 10,600.0
Decrease in credit facility maximum borrowing capacity						$ 1,100.0
Unsecured Debt \| Term Loan Agreement \| Line of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			4,300.0
Amount outstanding					0.0
Commitment fees percentage		0.10%
Unsecured Debt \| Term Loan Agreement, Tranche One \| Line of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 1,450.0
Debt instrument, term			2 years
Unsecured Debt \| Term Loan Agreement, Tranche One \| Line of Credit \| Minimum \| SOFR
Debt Instrument [Line Items]
Borrowings, interest rate			0.875%
Unsecured Debt \| Term Loan Agreement, Tranche One \| Line of Credit \| Minimum \| ABR
Debt Instrument [Line Items]
Borrowings, interest rate			0.00%
Unsecured Debt \| Term Loan Agreement, Tranche One \| Line of Credit \| Maximum \| SOFR
Debt Instrument [Line Items]
Borrowings, interest rate			1.375%
Unsecured Debt \| Term Loan Agreement, Tranche One \| Line of Credit \| Maximum \| ABR
Debt Instrument [Line Items]
Borrowings, interest rate			0.375%
Unsecured Debt \| Term Loan Agreement, Tranche Two \| Line of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 2,850.0
Debt instrument, term			3 years
Unsecured Debt \| Term Loan Agreement, Tranche Two \| Line of Credit \| Minimum \| SOFR
Debt Instrument [Line Items]
Borrowings, interest rate			1.00%
Unsecured Debt \| Term Loan Agreement, Tranche Two \| Line of Credit \| Minimum \| ABR
Debt Instrument [Line Items]
Borrowings, interest rate			0.00%
Unsecured Debt \| Term Loan Agreement, Tranche Two \| Line of Credit \| Maximum \| SOFR
Debt Instrument [Line Items]
Borrowings, interest rate			1.50%
Unsecured Debt \| Term Loan Agreement, Tranche Two \| Line of Credit \| Maximum \| ABR
Debt Instrument [Line Items]
Borrowings, interest rate			0.50%
Revolving Credit Facility \| Senior Unsecured Committed Multicurrency Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 850.0
Revolving Credit Facility \| Unsecured Uncommitted Incremental Revolving Loan Facility \| Line of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 150.0
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit
Debt Instrument [Line Items]
Amount outstanding					$ 0.0		$ 0.0
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| ABR
Debt Instrument [Line Items]
Borrowings, interest rate			0.00%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Minimum
Debt Instrument [Line Items]
Commitment fees percentage			0.09%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Minimum \| Forecast
Debt Instrument [Line Items]
Commitment fees percentage	0.08%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Minimum \| SOFR
Debt Instrument [Line Items]
Borrowings, interest rate			0.785%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Minimum \| SOFR \| Forecast
Debt Instrument [Line Items]
Borrowings, interest rate	0.795%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Minimum \| ABR \| Forecast
Debt Instrument [Line Items]
Borrowings, interest rate	0.00%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Maximum
Debt Instrument [Line Items]
Commitment fees percentage			0.15%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Maximum \| Forecast
Debt Instrument [Line Items]
Commitment fees percentage	0.175%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Maximum \| SOFR
Debt Instrument [Line Items]
Borrowings, interest rate			0.975%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Maximum \| SOFR \| Forecast
Debt Instrument [Line Items]
Borrowings, interest rate	1.20%
Revolving Credit Facility \| Revolving Credit Agreement \| Line of Credit \| Maximum \| ABR \| Forecast
Debt Instrument [Line Items]
Borrowings, interest rate	0.20%