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Employee Benefit Plans, Pensions, and Other Retiree Benefits (401(k) Plan) (Details) | 12 Months Ended
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Sep. 28, 2018
Retirement Benefits [Abstract] |
Minimum age requirement | 21 years
Contribution percentage of employee earnings to retirement plan | 4.00%

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- Definition Minimum Age Requirement + References No definition available. + Details
Name: | swks_MinimumAgeRequirement
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_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration