Goodwill and Purchased Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010	Aug. 17, 2012 Duma technology [Member]	Dec. 29, 2012 Duma technology [Member]
Intangible Assets [Line Items]
Purchase price of the assets acquired				$ 1,000,000
Amortization period of intangible assets				3 years	2 years 7 months 6 days
Maximum future payments required				500,000
Rasco trade name	2,300,000	2,200,000
Amortization expenses related to intangible assets	4,057,000	4,645,000	6,059,000
2013	4,300,000
2014	4,300,000
2015	4,200,000
2016	$ 3,800,000