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Stockholder's Equity (Narrative) (Details)
 12 Months Ended
Sep. 29, 2018
item
Class of Stock [Line Items]  
Percentage of cash dividend or liquidation payment based on Class B common stock 110.00%
Minimum [Member]  
Class of Stock [Line Items]  
Number of directors that can be set by board of directors 5
Maximum [Member]  
Class of Stock [Line Items]  
Number of directors that can be set by board of directors 11
Class A Common Stock [Member]  
Class of Stock [Line Items]  
Number of votes per share held by common stock holders 1
Percentage of directors to be elected by holders of common stock 25.00%
Class B Common Stock [Member]  
Class of Stock [Line Items]  
Number of votes per share held by common stock holders 10
Minimum percentage of outstanding common stock of both classes represented by common stock 12.50%