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Employee Stock Plans (Narrative) (Details)
shares in Millions
Apr. 09, 2015
$ / shares
Dec. 27, 2015
$ / shares
shares
Sep. 27, 2015
$ / shares
Class of Stock [Line Items]      
Common stock, par value | $ / shares   $ 0.001 $ 0.001
Common Stock [Member]      
Class of Stock [Line Items]      
Stock split conversion ratio 2    
Common stock, par value | $ / shares $ 0.001    
Stock Options and Restricted Stock Units [Member]      
Common stock available for issuance pursuant to future equity-based compensation awards and ESPP | shares   84.4  
Employee Stock Purchase Plan [Member]      
Common stock available for issuance pursuant to future equity-based compensation awards and ESPP | shares   14.2