XML 76 R64.htm IDEA: XBRL DOCUMENT v3.19.2

Stock Repurchase Program - Additional Information (Detail) - USD ($)	1 Months Ended				3 Months Ended					4 Months Ended	9 Months Ended
	Aug. 31, 2019	Jun. 30, 2019	May 31, 2019	Feb. 28, 2019	Aug. 31, 2019	Jul. 31, 2019	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	May 31, 2019	Jul. 31, 2019	Jul. 31, 2018	Jun. 14, 2019
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program authorized amount						$ 500,000,000.0					$ 500,000,000.0		$ 500,000,000.0
Remaining amount available for further repurchases						$ 500,000,000.0					$ 500,000,000.0
Purchases of treasury stock (in shares)						775,000	1,509,000				1,901,000	4,411,000
Accelerated Share Repurchase Program February 2019 ASR
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program authorized amount				$ 100,000,000.0
Prepayment to repurchase stock				100,000,000.0
Initial share delivery				$ 80,000,000.0
Stock repurchase program, prepayment during prior period, derivative settlement			$ 20,000,000.0
Purchases of treasury stock (in shares)			97,601							900,000
Shares repurchased average price per share (in USD per share)										$ 114.01
Accelerated Share Repurchase Program June 2019 ASR
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program authorized amount		$ 100,000,000.0
Prepayment to repurchase stock		100,000,000.0
Initial share delivery		$ 80,000,000.0
Accelerated Share Repurchase Program September 2017
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, prepayment during prior period, derivative settlement									$ 20,000,000.0
Open Market Share Repurchase
Equity, Class of Treasury Stock [Line Items]
Purchases of treasury stock (in shares)								400,000
Shares repurchased average price per share (in USD per share)								$ 82.61
Shares repurchased during period								$ 35,000,000.0
Subsequent Event | Accelerated Share Repurchase Program June 2019 ASR
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, prepayment during prior period, derivative settlement	$ 20,000,000.0
Purchases of treasury stock (in shares)	90,202				800,000
Shares repurchased average price per share (in USD per share)					$ 130.23

X

- Definition

Accelerated share repurchase initial share delivery amount.

+ References

No definition available.

+ Details

Name:	snps_AcceleratedShareRepurchaseInitialShareDeliveryAmount
Namespace Prefix:	snps_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Stock Repurchase Program, Prepayment During Period

+ References

No definition available.

+ Details

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

X

- Definition

Stock Repurchase Program, Prepayment During Prior Period, Derivative Settlement

+ References

No definition available.

+ Details

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

X

- 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

No definition available.

+ Details

Name:	us-gaap_EquityClassOfTreasuryStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_StockRepurchasedDuringPeriodValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

Name:	us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=snps_AcceleratedShareRepurchaseProgramFebruary2019ASRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=snps_AcceleratedShareRepurchaseProgramJune2019ASRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=snps_AcceleratedShareRepurchaseProgramSeptember2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=snps_OpenMarketShareRepurchaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: