Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2015 tender	Sep. 29, 2017 USD ($)	Sep. 30, 2016 USD ($)	Oct. 02, 2015 USD ($)
Commitments And Contingencies [Line Items]
Long-term warranty accrual		$ 4.3	$ 3.8
Minimum rentals under operating leases fiscal year 2018		24.9
Minimum rentals under operating leases fiscal year 2019		20.3
Minimum rentals under operating leases fiscal year 2020		17.0
Minimum rentals under operating leases fiscal year 2021		13.9
Minimum rentals under operating leases fiscal year 2022		11.7
Minimum rentals, thereafter		19.1
Rental expenses		26.4	24.3	$ 27.0
Environmental cleanup costs, third-party claim costs, project management costs and legal costs		0.7	0.9	1.0
Receivables of past and future environmental-related expenditures		1.6	1.6
Restructuring Charges (Reversals)		12.6
Payments for restructuring		$ 10.3
Portugal Investigation
Commitments And Contingencies [Line Items]
Number of tenders | tender	3
Cercla Sites And One Past Facility
Commitments And Contingencies [Line Items]
Responsibility percentage		33.33%
Patents | University of Pittsburgh
Commitments And Contingencies [Line Items]
Amortization period for intangible assets (in years)		2 years 6 months
Cercla Sites And One Past Facility
Commitments And Contingencies [Line Items]
Amount accrued for environmental remediation expense		$ 1.0
Cercla Sites And One Past Facility | Minimum
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs		$ 1.0
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		$ 8.0
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		$ 5.0
Site contingency loss best estimate		$ 5.8
Accrual for environmental loss contingencies discount rate (as a percent)		4.00%
Other Sites | Minimum
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs		$ 3.7
Estimated time frames to resolve contingency related to environmental remediation contingencies (in years)		1 year
Other Sites | Maximum
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs		$ 19.7
Estimated time frames to resolve contingency related to environmental remediation contingencies (in years)		30 years
2017 Restructuring Plan
Commitments And Contingencies [Line Items]
Restructuring Charges (Reversals)		$ 13.2
Payments for restructuring		9.3
2016 Restructuring Plan
Commitments And Contingencies [Line Items]
Restructuring Charges (Reversals)		$ (0.6)	$ 3.5
2015 Restructuring Plan
Commitments And Contingencies [Line Items]
Restructuring Charges (Reversals)				$ 11.4