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Stockholder's Equity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 03, 2015
Apr. 03, 2015
Nov. 11, 2014
Stockholders' Equity Note [Abstract]      
Stock repurchase authorized     $ 300.0swks_StockRepurchaseAuthorizedDollarAmount
Payments for repurchase of common stock 48.1us-gaap_TreasuryStockValueAcquiredParValueMethod 79.1us-gaap_TreasuryStockValueAcquiredParValueMethod  
Treasury stock acquired (shares) 0.6us-gaap_TreasuryStockSharesAcquired 1.1us-gaap_TreasuryStockSharesAcquired  
Average cost per share (usd per share) $ 80.12us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 71.90us-gaap_TreasuryStockAcquiredAverageCostPerShare  
Remaining authorized repurchase amount $ 220.9us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 $ 220.9us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1