Share-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 30, 2011
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	$ 42,600	$ 47,900	$ 42,000
Taxes on earnings	(12,989)	(15,406)	(14,063)
Net share-based compensation expense	29,648	32,469	27,955
Cost of revenues - Product
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	4,088	4,419	3,917
Cost of revenues - Service
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	3,460	1,472	1,977
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	5,993	6,378	5,467
Selling, general and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	$ 29,096	$ 35,606	$ 30,657