Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Jul. 03, 2020 USD ($)	Oct. 01, 2021 USD ($)	Oct. 02, 2020 USD ($)	Sep. 27, 2019 USD ($)	Sep. 28, 2018 USD ($)	Oct. 16, 2018 numberOfPatents
Commitments And Contingencies [Line Items]
Minimum rentals under operating leases fiscal year 2020				$ 32.5
Minimum rentals under operating leases fiscal year 2021				26.3
Minimum rentals under operating leases fiscal year 2022				20.2
Minimum rentals under operating leases fiscal year 2023				14.5
Minimum rentals under operating leases fiscal year 2024				10.9
Minimum rentals, thereafter				49.9
Lessor, operating lease, term of contract			16 years
Income on equipment leases			$ 9.4	8.8	$ 3.8
Purchase obligation, due in fiscal year 2019			88.9
Purchase obligation, due in fiscal year 2020			50.8
Purchase obligation, due in fiscal year 2021			24.3
Purchase obligation, due in fiscal year 2022			20.2
Purchase obligation, due in fiscal year 2023			11.6
Receivables of past and future environmental-related expenditures			1.0	$ 1.1
Restructuring charges	$ 13.9		18.7
Payments for restructuing			12.0
Number of patents with alleged infringement | numberOfPatents						4
Best Medical International | Judicial Ruling
Commitments And Contingencies [Line Items]
Loss contingency accrual			8.5
Forecast
Commitments And Contingencies [Line Items]
Payments for restructuing		$ 6.7
Siemens Healthineers
Commitments And Contingencies [Line Items]
Business combination, reverse termination fee			450.0
Business combination, early termination fee, cash payable			925.0
Siemens Healthineers
Commitments And Contingencies [Line Items]
Business combination, early termination fee			450.0
Siemens Healthineers | Advisory Fees
Commitments And Contingencies [Line Items]
Contingent consideration			$ 110.0
Minimum
Commitments And Contingencies [Line Items]
Operating Lease, Remaining Lease Term			1 year
Finance Lease, Remaining Lease Term			1 year
Maximum
Commitments And Contingencies [Line Items]
Operating Lease, Remaining Lease Term			20 years
Finance Lease, Remaining Lease Term			7 years
Cercla Sites And One Past Facility
Commitments And Contingencies [Line Items]
Amount accrued for environmental remediation expense			$ 0.5
Cercla Sites And One Past Facility | Minimum
Commitments And Contingencies [Line Items]
Loss contingency, estimated possible loss			$ 0.5
Estimated time frames to resolve contingency related to environmental remediation contingencies (in years)			1 year
Cercla Sites And One Past Facility | Maximum
Commitments And Contingencies [Line Items]
Loss contingency, estimated possible loss			$ 3.9
Estimated time frames to resolve contingency related to environmental remediation contingencies (in years)			30 years
Other Sites
Commitments And Contingencies [Line Items]
Amount accrued for environmental remediation expense			$ 3.5
Site contingency loss best estimate			3.8
Accrual for environmental loss contingencies discount rate (as a percent)				4.00%
Other Sites | Minimum
Commitments And Contingencies [Line Items]
Loss contingency, estimated possible loss			$ 3.1
Estimated time frames to resolve contingency related to environmental remediation contingencies (in years)			0 years
Other Sites | Maximum
Commitments And Contingencies [Line Items]
Loss contingency, estimated possible loss			$ 21.3
Estimated time frames to resolve contingency related to environmental remediation contingencies (in years)			30 years
Other Long-term Liabilities
Commitments And Contingencies [Line Items]
Long-term warranty accrual			$ 3.5	$ 3.2
Equipment
Commitments And Contingencies [Line Items]
Property plant and equipment related to leases			26.5	22.5
Accumulated depreciation related to leases			$ 9.1	$ 5.5