Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
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
Rental expenses	28.4	$ 28.7	$ 26.4
Purchase obligation, due in fiscal year 2019	48.9
Purchase obligation, due in fiscal year 2020	30.8
Purchase obligation, due in fiscal year 2021	19.3
Purchase obligation, due in fiscal year 2022	11.3
Purchase obligation, due in fiscal year 2023	10.1
Receivables of past and future environmental-related expenditures	$ 1.1	1.4
Lessor, Operating Lease, Term of Contract	15 years
Property, Plant and Equipment, Gross	$ 785.8	703.8
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	474.3	429.2
Income on equipment leases	8.8	$ 3.8
Cercla Sites And One Past Facility
Commitments And Contingencies [Line Items]
Amount accrued for environmental remediation expense	0.7
Cercla Sites And One Past Facility | Minimum
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs	$ 0.7
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]
Estimated environmental remediation costs	$ 4.2
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	$ 4.1
Site contingency loss best estimate	4.5
Accrual for environmental loss contingencies discount rate (as a percent)		4.00%
Other Sites | Minimum
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs	$ 3.6
Estimated time frames to resolve contingency related to environmental remediation contingencies (in years)	0 years
Other Sites | Maximum
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs	$ 18.7
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	$ 3.2	$ 3.9
Equipment
Commitments And Contingencies [Line Items]
Property, Plant and Equipment, Gross	22.5	19.2
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 5.5	$ 1.3