Business Segment Information - Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Segment Reporting Information [Line Items]
Net Revenues	$ 174,198	$ 160,192	$ 337,679	$ 317,343
Segment Operating Income	7,754	13,092	16,877	23,702
Depreciation and Amortization Expenses	7,898	6,986	15,666	13,908
Capital Expenditures	5,429	3,844	10,497	6,457
Operating Segments
Segment Reporting Information [Line Items]
Segment Operating Income	14,875	19,967	29,173	37,586
Segment Reconciling Items
Segment Reporting Information [Line Items]
Corporate General and Administrative Expenses	(7,121)	(6,875)	(12,296)	(13,884)
Corporate Administration
Segment Reporting Information [Line Items]
Depreciation and Amortization Expenses	58	59	117	118
Capital Expenditures	0	0	0	0
Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues	109,732	102,797	207,198	201,901
Electronic Systems | Operating Segments
Segment Reporting Information [Line Items]
Segment Operating Income	13,610	14,375	23,021	26,866
Depreciation and Amortization Expenses	3,484	3,426	6,990	6,849
Capital Expenditures	2,943	1,277	4,639	1,901
Structural Systems
Segment Reporting Information [Line Items]
Net Revenues	64,466	57,395	130,481	115,442
Structural Systems | Operating Segments
Segment Reporting Information [Line Items]
Segment Operating Income	1,265	5,592	6,152	10,720
Depreciation and Amortization Expenses	4,356	3,501	8,559	6,941
Capital Expenditures	$ 2,486	$ 2,567	$ 5,858	$ 4,556