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Marketable Securities Contractual Maturity (Details) | 9 Months Ended
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Jun. 26, 2020
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities, Debt Maturities, Date | 2 years

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- 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_DebtSecuritiesAvailableforsaleNoncurrentMaximumContractualMaturity
Namespace Prefix: | swks_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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