Document and Entity Information	6 Months Ended
	Apr. 30, 2015	May 20, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
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		155,086,820