Taxes on Earnings - Schedule of Income Taxes Paid (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 26, 2014
Income Taxes Paid Net [Line Items]
Income taxes paid	$ 155.9	$ 119.8	$ 140.8
Federal
Income Taxes Paid Net [Line Items]
Income taxes paid	78.3	57.1	66.2
State
Income Taxes Paid Net [Line Items]
Income taxes paid	5.0	7.2	7.3
Foreign
Income Taxes Paid Net [Line Items]
Income taxes paid	$ 72.6	$ 55.5	$ 67.3