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Employee Pension and Profit Sharing Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 435.1	$ 398.8
Settlement gains recognized in other comprehensive loss, before tax	0.2	0.1
Actuarial losses recognized in other comprehensive loss, before tax	33.1	32.9
Amortization of actuarial gains (losses) recognized as net periodic pension cost	2.3	1.2
Net actuarial gain (loss) included in accumulated other comprehensive income (loss) to be recognized in next fiscal year	2.7
Expected future employer contributions during fiscal year 2017	$ 3.4
Equity Funds, Domestic
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	36.00%
Equity Funds, International
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	64.00%
United States
Defined Benefit Plan Disclosure [Line Items]
Defined contribution cost recognized	$ 17.4	41.5	$ 22.5
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution cost recognized	$ 13.7	$ 11.7	$ 8.6
Minimum \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Minimum target plan asset allocations	10.00%
Minimum \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Minimum target plan asset allocations	50.00%
Minimum \| Real Estate and Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Minimum target plan asset allocations	1000.00%
Maximum \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Minimum target plan asset allocations	30.00%
Maximum \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Minimum target plan asset allocations	80.00%
Maximum \| Real Estate and Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Minimum target plan asset allocations	20.00%