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Stock Repurchase Program - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 03, 2013 | Jul. 31, 2014
StockRepurchaseProgram [Abstract] |  |
Stock repurchase program authorized amount | $ 500.0 | $ 500.0
Remaining amount available for further repurchases |  | $ 420.3

X
- Details
Name: | snps_StockRepurchaseProgramAbstract
Namespace Prefix: | snps_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration