Quarterly report [Sections 13 or 15(d)]

Segment Information - Schedule of Segment Reporting Information (Details)

v3.26.1
Segment Information - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2026
Jun. 28, 2025
Jul. 04, 2026
Jun. 28, 2025
Segment Reporting        
Sales $ 259,957 $ 204,678 $ 490,576 $ 410,614
Cost of Products Sold 173,060 151,851 328,546 296,938
Operating Profit 40,467 4,758 67,697 17,895
Deductions from Segment Measure of Operating Profit:        
Interest Expense, Net of Interest Income 2,332 3,097 4,668 6,247
Income Before Income Taxes 37,854 1,851 62,639 12,025
Operating profit impact of adverse change in costs on long-term mass transit test contracts   6,900   8,800
Aerospace        
Segment Reporting        
Sales 237,292 193,626 451,112 385,001
Test Systems Segment        
Segment Reporting        
Sales 22,665 11,052 39,464 25,613
Operating Segments, Excluding Intersegment Elimination | Aerospace        
Segment Reporting        
Sales 237,292 193,647 451,135 385,035
Operating Segments, Excluding Intersegment Elimination | Test Systems Segment        
Segment Reporting        
Sales 22,674 11,341 39,498 25,933
Less Inter-segment Sales | Aerospace        
Segment Reporting        
Sales 0 (21) (23) (34)
Less Inter-segment Sales | Test Systems Segment        
Segment Reporting        
Sales (9) (289) (34) (320)
Operating Segments        
Segment Reporting        
Operating Profit $ 48,856 $ 11,329 $ 84,591 $ 31,370
Operating Margins 18.80% 5.50% 17.20% 7.60%
Operating Segments | Aerospace        
Segment Reporting        
Sales $ 237,292 $ 193,626 $ 451,112 $ 385,001
Cost of Products Sold $ 155,140 $ 138,735 $ 298,267 $ 271,627
Cost of Products Sold Margins 65.40% 71.70% 66.10% 70.60%
Other Segment Items $ 33,888 $ 36,852 $ 69,249 $ 73,071
Operating Profit $ 48,264 $ 18,039 $ 83,596 $ 40,303
Operating Margins 20.30% 9.30% 18.50% 10.50%
Operating Segments | Test Systems Segment        
Segment Reporting        
Sales $ 22,665 $ 11,052 $ 39,464 $ 25,613
Cost of Products Sold $ 17,920 $ 13,116 $ 30,279 $ 25,311
Cost of Products Sold Margins 79.10% 118.70% 76.70% 98.80%
Other Segment Items $ 4,153 $ 4,646 $ 8,190 $ 9,235
Operating Profit $ 592 $ (6,710) $ 995 $ (8,933)
Operating Margins 2.60% (60.70%) 2.50% (34.90%)
Corporate Expenses and Other        
Deductions from Segment Measure of Operating Profit:        
Corporate Expenses and Other $ 8,670 $ 6,381 $ 17,284 $ 13,098