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Earnings Per Share (Narrative) (Details)
shares in Millions
12 Months Ended
Sep. 29, 2018
Classes
shares
Sep. 30, 2017
shares
Oct. 01, 2016
shares
Earnings Per Share, Basic and Diluted [Line Items]      
Cash Dividends, Paid Ratio To Other Class Of Stock, Maximum 90.00%    
Number of classes of common stock | Classes 2    
Class A [Member]      
Earnings Per Share, Basic and Diluted [Line Items]      
Undistributed earnings (losses), ratio used to calculate allocation to class of stock 1    
Class B [Member]      
Earnings Per Share, Basic and Diluted [Line Items]      
Undistributed earnings (losses), ratio used to calculate allocation to class of stock 0.9    
Stock-based compensation [Member]      
Earnings Per Share, Basic and Diluted [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares 1 1 0