Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended
	Oct. 02, 2015 USD ($) reporting_unit	Sep. 26, 2014 USD ($) reporting_unit	Sep. 27, 2013 USD ($) reporting_unit	Apr. 02, 1999 company
Significant Accounting Policies [Line Items]
Product Warranty, Period	12 months
Number of publicly traded companies | company				3
Number of publicly traded companies distributed to stockholders | company				2
Foreign currency gain (loss) before tax	$ (2.0)	$ (0.5)	$ 0.7
Carrying value of equity investments in privately-held companies	49.7	49.7
Impairment		7.7
Equity investments under cost method	$ 15.0	$ 15.0
Number of reporting units tested for impairment of goodwill | reporting_unit	4	4	4
Costs incurred and revenues recognized in excess of customer billings	$ 79.1	$ 57.2
Customer billings in excess of costs incurred and revenue recognized	$ 53.8	$ 52.6
Excise tax on sales of medical devices, percentage	2.30%
Minimum
Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)	2 years
Maximum
Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)	17 years
Land Improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	15 years
Building | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	20 years
Building | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	30 years
Machinery and Equipment | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	3 years
Machinery and Equipment | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)	7 years
Assets Subject To Lease
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	the lesser of estimated useful lives or remaining lease terms
Land Leasehold Rights And Leasehold Improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	the lesser of estimated useful lives or remaining lease terms