Taxes on Earnings - Schedule of Income Taxes Paid (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Income Taxes Paid Net [Line Items]
Income taxes paid, net	$ 144.1	$ 155.9	$ 119.8
Federal
Income Taxes Paid Net [Line Items]
Income taxes paid, net	62.0	78.3	57.1
State
Income Taxes Paid Net [Line Items]
Income taxes paid, net	5.0	5.0	7.2
Foreign
Income Taxes Paid Net [Line Items]
Income taxes paid, net	$ 77.1	$ 72.6	$ 55.5