Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans Employee Savings and Retirement Plan (Details)

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Employee Benefit Plans Employee Savings and Retirement Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 29, 2013
Employee Savings and Retirement Plan [Abstract]      
Percentage of eligible employee compensation that can be contributed to 401(k) plan subject to annual limits 85.00%    
Company's contribution expense to 401(k) plan $ 81 $ 77 $ 70