Commitments and Contingencies - Additional Information (Detail)	1 Months Ended	3 Months Ended			12 Months Ended
	Jun. 30, 2015 tender	Jun. 27, 2014 USD ($)	Mar. 28, 2014 USD ($)	Dec. 27, 2013 USD ($)	Sep. 30, 2016 USD ($)	Oct. 02, 2015 USD ($)	Sep. 26, 2014 USD ($)
Commitments And Contingencies [Line Items]
Long-term warranty accrual					$ 3,700,000	$ 2,000,000
Minimum rentals under operating leases fiscal year 2017					27,500,000
Minimum rentals under operating leases fiscal year 2018					20,800,000
Minimum rentals under operating leases fiscal year 2019					15,300,000
Minimum rentals under operating leases fiscal year 2020					12,300,000
Minimum rentals under operating leases fiscal year 2021					11,000,000
Minimum rentals, thereafter					19,400,000
Rental expenses					28,100,000	28,800,000	$ 28,700,000
Environmental cleanup costs, third-party claim costs, project management costs and legal costs					1,100,000	1,300,000	1,200,000
Receivables of past and future environmental-related expenditures					2,000,000	2,100,000
Restructuring charges					5,300,000	$ 13,300,000	$ 0
Payments for restructuring					$ 4,000,000
Portugal Investigation
Commitments And Contingencies [Line Items]
Number of tenders | tender	3
University of Pittsburgh
Commitments And Contingencies [Line Items]
Settlement amount		$ 35,600,000
Losses accrued			$ 25,100,000	$ 5,000,000
Prepaid royalties		$ 5,500,000
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					$ 1,300,000
Cercla Sites And One Past Facility | Minimum
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs, maximum					$ 1,300,000
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, maximum					$ 9,900,000
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					$ 6,800,000
Site contingency loss best estimate					$ 8,100,000
Accrual for environmental loss contingencies discount rate (as a percent)					4.00%
Other Sites | Minimum
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs, maximum					$ 5,300,000
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, maximum					$ 25,500,000
Estimated time frames to resolve contingency related to environmental remediation contingencies (in years)					30 years