Document and Entity Information
Aug. 21, 2019
Cover [Abstract]  
Entity Registrant Name SYNOPSYS INC
Amendment Flag false
Entity Central Index Key 0000883241
Document Type 8-K
Document Period End Date Aug. 21, 2019
Entity Incorporation State Country Code DE
Entity File Number 000-19807
Entity Tax Identification Number 56-1546236
Entity Address, Address Line One 690 East Middlefield Road
Entity Address, City or Town Mountain View
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94043
City Area Code (650)
Local Phone Number 584-5000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock ($0.01 par value)
Trading Symbol SNPS
Security Exchange Name NASDAQ
Entity Emerging Growth Company false