Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 26, 2020	Dec. 28, 2019
Property, Plant and Equipment [Line Items]
Total	$ 259,919	$ 249,881
Less-accumulated depreciation and amortization	(168,910)	(148,044)
Property, plant and equipment, net	91,009	101,837
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total	37,676	37,513
Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Total	131,853	126,663
Furniture, Fixtures and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total	5,468	5,308
Software and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total	$ 84,922	$ 80,397