Property Plant and Equipment Net (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2012	Dec. 30, 2011	Jun. 24, 2011
Property, Plant and Equipment [Line Items]
Cost	$ 161,463		$ 131,240
Less: Accumulated depreciation	(61,015)		(55,830)
Less: Impairment reserve	(2,525)	(2,525)
Net book value	97,923		75,410
Land
Property, Plant and Equipment [Line Items]
Cost	14,353		14,353
Net book value	14,353		14,353
Building and Building Improvement
Property, Plant and Equipment [Line Items]
Cost	72,508		40,743
Less: Accumulated depreciation	(11,677)		(9,330)
Less: Impairment reserve	(1,076)
Net book value	59,755		31,413
Manufacturing Equipment
Property, Plant and Equipment [Line Items]
Cost	55,729		53,002
Less: Accumulated depreciation	(37,017)		(35,307)
Less: Impairment reserve	(1,091)
Net book value	17,621		17,695
Office Equipment
Property, Plant and Equipment [Line Items]
Cost	5,566		5,341
Less: Accumulated depreciation	(3,009)		(2,632)
Less: Impairment reserve	(51)
Net book value	2,506		2,709
Motor Vehicles
Property, Plant and Equipment [Line Items]
Cost	638		784
Less: Accumulated depreciation	(601)		(695)
Net book value	37		89
Computers
Property, Plant and Equipment [Line Items]
Cost	11,389		10,528
Less: Accumulated depreciation	(8,711)		(7,866)
Less: Impairment reserve	(303)
Net book value	2,375		2,662
Construction and Machinery Under Installation
Property, Plant and Equipment [Line Items]
Cost	1,280		6,489
Less: Impairment reserve	(4)
Net book value	$ 1,276		$ 6,489