Taxes on Earnings - Schedule of Income Taxes Paid (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Income Taxes Paid Net [Line Items]
Income taxes paid, net	$ 97.1	$ 128.5	$ 86.0
Domestic Tax Authority
Income Taxes Paid Net [Line Items]
Income taxes paid, net	37.5	50.5	10.6
State and Local Jurisdiction
Income Taxes Paid Net [Line Items]
Income taxes paid, net	(0.1)	11.9	7.2
Foreign Tax Authority
Income Taxes Paid Net [Line Items]
Income taxes paid, net	$ 59.7	$ 66.1	$ 68.2