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Document and Entity Information
9 Months Ended
Jul. 31, 2013
Aug. 28, 2013
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 31, 2013  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q3  
Trading Symbol SNPS  
Entity Registrant Name SYNOPSYS INC  
Entity Central Index Key 0000883241  
Current Fiscal Year End Date --10-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   154,408,347