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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
Sep. 30, 2016
Oct. 02, 2015
Sep. 26, 2014
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 $ 26,291,308 $ 32,157,279 $ 33,668,769
Aggregate Number of Shares Sold 627,657 781,214 613,084
Shares reserved for future Issuance (in shares) 11,130,220    
Under the 1989 ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate Purchase Price Paid for Shares Sold $ 23,631,241 $ 28,621,800 $ 30,354,723
Aggregate Number of Shares Sold 564,461 696,853 553,201
Shares reserved for future Issuance (in shares) 599,506    
Under the GESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate Purchase Price Paid for Shares Sold $ 2,660,067 $ 3,535,479 $ 3,314,046
Aggregate Number of Shares Sold 63,196 84,361 59,883
Shares reserved for future Issuance (in shares) 64,628