Balance Sheet Information - Equipment and Leasehold Improvements, Net (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 28, 2014	Dec. 27, 2013
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 30,845	$ 30,523
Accumulated depreciation and amortization	(22,678)	(21,989)
Total	8,167	8,534
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	8,422	8,280
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	2,472	2,411
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	9,282	9,249
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 10,669	$ 10,583