Document and Entity Information (USD $)
12 Months Ended
Jan. 02, 2011
Feb. 17, 2011
Jul. 04, 2010
Document and Entity Information      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 02, 2011    
Document Fiscal Year Focus 2010    
Document Fiscal Period Focus FY    
Trading Symbol cy    
Entity Registrant Name CYPRESS SEMICONDUCTOR CORP /DE/    
Entity Central Index Key 0000791915    
Current Fiscal Year End Date --01-02    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   173,649,124  
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 1,300,000,000
Entity Current Reporting Status Yes    
Entity Voluntary Filers No