Strategic Technology Transactions, Goodwill and Other Purchased Intangible Assets - Allocation of Purchase Price (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012		Dec. 31, 2011	Dec. 31, 2012 Ismeca technology [Member]	Sep. 28, 2013 Original Values [Member] Ismeca technology [Member]	Sep. 28, 2013 Revised Values [Member] Ismeca technology [Member]
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]
Current assets						$ 36,510	$ 36,510
Fixed assets						1,314	1,314
Other assets						2,427	6,607
Intangible assets						25,365	33,138
Goodwill	70,895	58,756	[1]	58,060		19,273	11,245
Total assets acquired					88,800	84,889	88,814
Liabilities assumed					(31,700)	(27,746)	(31,671)
Net assets acquired					$ 57,100	$ 57,143	$ 57,143

[1] Derived from December 29, 2012 audited financial statements