Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended			6 Months Ended
	Apr. 03, 2015	Jun. 27, 2014	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014	Sep. 26, 2014	Apr. 30, 2012
Commitments And Contingencies [Line Items]
Long term accrued product warranty costs	$ 1,700,000			$ 1,700,000		$ 2,000,000
Commitment outstanding	300,000			300,000
Contingent consideration	6,300,000			6,300,000		7,500,000
Fixed Cost Commitments				8,900,000
Environmental cleanup costs, third-party claim costs, project management costs and legal costs	500,000		300,000	800,000	500,000
Receivables of past and future environmental-related expenditures	2,100,000			2,100,000		2,200,000
Full settlement of the lawsuit to the University of Pittsburgh		35,600,000
Loss Contingency Accrual			5,000,000		5,000,000
Litigation settlement			25,100,000
Prepaid Royalties		5,500,000
Enhanced Retirement Program and Workforce Reduction
Commitments And Contingencies [Line Items]
Restructuring charges	3,100,000		0	13,600,000	0
Payments for restructuring charges				7,500,000
Cercla sites and one past facility
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs, minimum	1,600,000			1,600,000
Estimated environmental remediation costs, maximum	9,800,000			9,800,000
Amount accrued for environmental remediation expense	1,600,000			1,600,000
Cercla sites and one past facility | Minimum
Commitments And Contingencies [Line Items]
Estimated time frames to resolve contingency related to environmental remediation contingencies, years				1 year
Cercla sites and one past facility | Maximum
Commitments And Contingencies [Line Items]
Estimated time frames to resolve contingency related to environmental remediation contingencies, years				30 years
Other sites
Commitments And Contingencies [Line Items]
Estimated environmental remediation costs, minimum	5,300,000			5,300,000
Estimated environmental remediation costs, maximum	35,700,000			35,700,000
Amount accrued for environmental remediation expense	7,600,000			7,600,000
Estimated environmental remediation costs, best estimate, undiscounted				9,300,000
Discount rate for environmental remediation costs, net of inflation	4.00%			4.00%
Other sites | Minimum
Commitments And Contingencies [Line Items]
Estimated time frames to resolve contingency related to environmental remediation contingencies, years				1 year
Other sites | Maximum
Commitments And Contingencies [Line Items]
Estimated time frames to resolve contingency related to environmental remediation contingencies, years				30 years
Siemens AG | Strategic Global Partnership
Commitments And Contingencies [Line Items]
Fixed fee committed	5,000,000			5,000,000			10,000,000
License fee committed	$ 12,000,000			$ 12,000,000			$ 20,000,000
Patents
Commitments And Contingencies [Line Items]
Finite-lived intangible asset, useful life				2 years 6 months