Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 28, 2012 Customer	Sep. 30, 2011	Oct. 01, 2010
Significant Accounting Policies [Line Items]
Foreign currency gain (loss) before tax	$ 400,000	$ (1,400,000)	$ 1,100,000
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 intangible assets	0	0	0
Goodwill impairment charges	0	0	0
Costs incurred and revenues recognized in excess of customer billings	48,800,000	34,000,000
Customer billings in excess of costs incurred and revenue recognized	32,600,000	3,100,000
Share-based compensation expenses	$ 47,900,000	$ 42,000,000	$ 39,800,000
Number of antidilutive securities excluded from computation of diluted weighted average shares outstanding	248,711	160,312	2,321,408
Weighted average exercise price	$ 61.94	$ 57.38	$ 52.90
Minimum
Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life	1 year
Maximum
Significant Accounting Policies [Line Items]
Finite-lived intangible assets, useful life	20 years
Land Improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	15 years
Building
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years
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
Assets Subject To Lease
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives	the lesser of estimated useful lives or lease terms
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