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Goodwill And Intangible Assets (Schedule Of Changes In Gross Carrying Amount Of Goodwill And Intangible Assets) (Details) (USD $) In Thousands | 12 Months Ended
--- | ---
Sep. 30, 2011 | Oct. 01, 2010
Goodwill and Intangible Assets Gross Total, Beginning Balance | $ 530,482 | $ 527,388
Goodwill and Intangible Assets Acquired During Period | 268,569 | 3,131
Goodwill and Intangible Assets Deductions During The Period | (75) | (37)
Goodwill and Intangible Assets Gross Total, Ending Balance | 798,976 | 530,482
Developed Technology [Member] |  |
Goodwill and Intangible Assets Gross Total, Beginning Balance | 14,150 | 13,750
Goodwill and Intangible Assets Acquired During Period | 6,510 | 400
Goodwill and Intangible Assets Deductions During The Period | 0 | 0
Goodwill and Intangible Assets Gross Total, Ending Balance | 20,660 | 14,150
Customer Relationships [Member] |  |
Goodwill and Intangible Assets Gross Total, Beginning Balance | 21,510 | 21,510
Goodwill and Intangible Assets Acquired During Period | 36,000 | 0
Goodwill and Intangible Assets Deductions During The Period | 0 | 0
Goodwill and Intangible Assets Gross Total, Ending Balance | 57,510 | 21,510
Patents and Other [Member] |  |
Goodwill and Intangible Assets Gross Total, Beginning Balance | 5,966 | 5,966
Goodwill and Intangible Assets Acquired During Period | 47,930 | 0
Goodwill and Intangible Assets Deductions During The Period | 0 | 0
Goodwill and Intangible Assets Gross Total, Ending Balance | 53,896 | 5,966
Trademarks [Member] |  |
Goodwill and Intangible Assets Gross Total, Beginning Balance | 3,269 | 3,269
Goodwill and Intangible Assets Acquired During Period | 600 | 0
Goodwill and Intangible Assets Deductions During The Period | 0 | 0
Goodwill and Intangible Assets Gross Total, Ending Balance | 3,869 | 3,269
Goodwill [Member] |  |
Goodwill and Intangible Assets Gross Total, Beginning Balance | 485,587 | 482,893
Goodwill and Intangible Assets Acquired During Period | 177,529 | 2,731
Goodwill and Intangible Assets Deductions During The Period | (75) | (37)
Goodwill and Intangible Assets Gross Total, Ending Balance | $ 663,041 | $ 485,587

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Balance Type: | debit
Period Type: | duration

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Namespace Prefix: | swks
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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