Employee Stock Plans - Activity for Restricted Stock Restricted Stock Units and Performance Units (Detail) shares in Millions	12 Months Ended
	Sep. 29, 2017 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	1.0
Granted (in shares) | shares	0.4
Adjustment due to Distribution (shares) | shares	0.1
Vested (in shares) | shares	(0.4)
Cancelled or expired (in shares) | shares	(0.2)
Ending balance (in shares) | shares	0.9
Weighted Average Grant-Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 82.51
Granted (in dollars per share) | $ / shares	83.96
Adjustment due to Distribution (in dollars per share) | $ / shares	74.18
Vested (in dollars per share) | $ / shares	72.77
Canceled or expired (in dollars per share) | $ / shares	72.74
Ending balance (in dollars per share) | $ / shares	$ 75.37