Net Share-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	$ 9,596	$ 13,228	$ 18,640	$ 23,391
Taxes on earnings	(2,939)	(4,009)	(5,737)	(7,178)
Net share-based compensation expense	6,657	9,219	12,903	16,213
Cost of revenues - Product
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	717	1,274	1,424	2,385
Cost of revenues - Service
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	1,115	1,098	2,062	1,461
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	1,320	1,487	2,621	3,226
Selling, general and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expenses	$ 6,444	$ 9,369	$ 12,533	$ 16,319