Taxes on Earnings - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017	Sep. 29, 2018	Sep. 30, 2016
Income Tax [Line Items]
Tax Cuts and Jobs Act, income tax expense	$ 6.2
Tax Cuts and Jobs Act, total tax expense recognized	214.0
Tax Cuts and Jobs Act, provisional income tax expense		$ 207.8
Cumulative effect of a change in accounting principle				$ 0.2
Increase (decrease) in valuation allowance	(1.9)	4.2	$ 26.2
Unrecognized tax benefits	49.8	43.5	$ 42.7		$ 40.7
Amount that would affect the effective tax rate	30.7
Accrued interest and penalties related to unrecognized tax benefits	7.5	6.6
Net benefit related to interest and penalties was included in taxes on earnings	0.9	$ 1.8
Foreign Tax Authority
Income Tax [Line Items]
Net operating loss carry forwards	382.3
Amount unavailable to the company under local loss utilization	22.1
Internal Revenue Service (IRS)
Income Tax [Line Items]
Net operating loss carry forwards	8.1
Federal
Income Tax [Line Items]
Net operating loss carryforwards subject to an annual limitation	0.8
State and Local Jurisdiction
Income Tax [Line Items]
Net operating loss carry forwards	$ 5.7