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Equity-Based Compensation - Information about Restricted Stock Unit Transactions (Detail)
shares in Millions
12 Months Ended
Sep. 29, 2018
$ / shares
shares
Units  
Unvested at beginning of year | shares 9
Granted | shares 5
Vested | shares (4)
Forfeited | shares (1)
Unvested at end of year | shares 9
Weighted Average Grant-Date Fair Value  
Unvested at beginning of year | $ / shares $ 101.17
Granted | $ / shares 109.05
Vested | $ / shares 113.21
Forfeited | $ / shares 107.23
Unvested at end of year | $ / shares $ 108.74