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Employee Stock Purchase And Stock Option Plans (Stock Issuance Activity Under The 1989 ESPP And The GESPP) (Details) - USD ($)
12 Months Ended
Oct. 02, 2015
Sep. 26, 2014
Sep. 27, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Discount (percent) available to employees on the purchase of common stock 5.00%    
Aggregate Purchase Price Paid for Shares Sold $ 32,157,279 $ 33,668,769 $ 33,081,426
Aggregate Number of Shares Sold 781,214 613,084 707,638
Shares reserved for future Issuance (in shares) 11,217,591    
Under the 1989 ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate Purchase Price Paid for Shares Sold $ 28,621,800 $ 30,354,723 $ 30,012,848
Aggregate Number of Shares Sold 696,853 553,201 642,675
Shares reserved for future Issuance (in shares) 1,163,967    
Under the GESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate Purchase Price Paid for Shares Sold $ 3,535,479 $ 3,314,046 $ 3,068,578
Aggregate Number of Shares Sold 84,361 59,883 64,963
Shares reserved for future Issuance (in shares) 127,824