Balance Sheet Information - Equipment and Leasehold Improvement, Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 30,523	$ 28,519
Accumulated depreciation and amortization	(21,989)	(19,237)
Total	8,534	9,282
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	8,280	8,148
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	2,411	1,682
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	9,249	8,597
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 10,583	$ 10,092