Document and Entity Information - USD ($)
12 Months Ended
Sep. 28, 2018
Nov. 07, 2018
Mar. 31, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name Skyworks Solutions, Inc.    
Entity Central Index Key 0000004127    
Document Type 10-K    
Document Period End Date Sep. 28, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --09-28    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 18,194,560,180
Entity Common Stock, Shares Outstanding   177,531,995