Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 27, 2013 Customer	Sep. 28, 2012	Sep. 30, 2011
Significant Accounting Policies [Line Items]
Excise tax on sales of medical devices, percentage	2.30%
Foreign currency gain (loss) before tax	$ 700,000	$ 400,000	$ (1,400,000)
Equity investments under cost method	21,400,000	21,400,000
Impairment loss on equity investments in privately held companies	0	0	0
Number of customers accounted for more than 10% of total accounts receivable	0
Impairment charges for long-lived assets and identifiable assets	0	0	0
Goodwill impairment charges	0	0	0
Costs incurred and revenues recognized in excess of customer billings	68,100,000	48,800,000
Customer billings in excess of costs incurred and revenue recognized	33,800,000	32,600,000
Share-based compensation expenses	$ 42,600,000	$ 47,900,000	$ 42,000,000
Minimum
Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	1 year
Maximum
Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	20 years
Land Improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	15 years
Building | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years
Building | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	30 years
Machinery and Equipment | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Machinery and Equipment | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	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