v2.4.0.6

Segment Disclosure (Narrative) (Details) | 12 Months Ended
--- | ---
Oct. 31, 2011 | Oct. 31, 2010 | Oct. 31, 2009
Segment Disclosure [Abstract] |  |  |
Number of reportable operating segments | 1 | 1 | 1
Number of major customers | 1 | 1 | 1
Percentage of revenues contributed by major customers | 10.60% | 10.90% | 10.80%

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 revenues contributed by major customers. + References No definition available. + Details
Name: | snps_PercentageOfRevenuesContributedByMajorCustomers
Namespace Prefix: | snps_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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