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Marketable Securities (Details) | 12 Months Ended
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Sep. 28, 2018
Investments, Debt and Equity Securities [Abstract] |
available for sale securities, debt maturities | two years or less

X
- Definition Date of maturity of a debt security categorized as neither trading nor held to maturity, string text + References No definition available. + Details
Name: | swks_Availableforsalesecuritiesdebtmaturities
Namespace Prefix: | swks_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration