v2.4.0.6

Segment Disclosure - Additional information (Detail) | 12 Months Ended
--- | ---
Oct. 31, 2012 Segment Customer | Oct. 31, 2011 Customer Segment | Oct. 31, 2010 Segment Customer
Segment Reporting Information [Line Items] |  |  |
Number of reportable operating segment | 1 | 1 | 1
Number of major customers | 1 | 1 | 1
Percentage of revenues contributed by major customers | 10.50% | 10.60% | 10.90%

X
- Definition Number of major customers. + References No definition available. + Details
Name: | snps_NumberOfMajorCustomers
Namespace Prefix: | snps_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of reportable operating segments. + References No definition available. + Details
Name: | snps_NumberOfReportableOperatingSegments
Namespace Prefix: | snps_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration