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Stockholder's Equity (Narrative) (Details)
 12 Months Ended
Sep. 26, 2015
item
Sep. 27, 2014
shares
Sep. 28, 2013
shares
Class of Stock [Line Items]      
Percentage of cash dividend or liquidation payment based on Class B common stock 110.00%    
Shares authorized for repurchase | shares     4,000,000
Shares repurchased during the period | shares   4,000,000  
Minimum [Member]      
Class of Stock [Line Items]      
Number of directors that can be set by board of directors | item 5    
Maximum [Member]      
Class of Stock [Line Items]      
Number of directors that can be set by board of directors | item 11    
Class A Common Stock      
Class of Stock [Line Items]      
Number of votes per share held by common stock holders | item 1    
Percentage of directors to be elected by holders of common stock 25.00%    
Class B Common Stock      
Class of Stock [Line Items]      
Number of votes per share held by common stock holders | item 10    
Minimum percentage of outstanding common stock of both classes represented by common stock 12.50%    
Shares authorized for repurchase | shares   2,500,000 1,500,000
Shares repurchased during the period | shares   2,500,000