Quarterly report [Sections 13 or 15(d)]

Segment Information - Schedule of Segment Reporting Information (Details)

v3.26.3
Segment Information - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 03, 2026
Sep. 27, 2025
Oct. 03, 2026
Sep. 27, 2025
Segment Reporting [Line Items]        
Sales $ 271,679 $ 211,447 $ 762,255 $ 622,061
Cost of Products Sold 177,705 146,936 506,251 443,874
Total Operating Profit 53,983 23,055 121,680 40,950
Deductions from Segment Measure of Operating Profit:        
Loss on Settlement of Debt 0 32,644 0 32,644
Interest Expense, Net of Interest Income 1,838 2,920 6,506 9,167
Income (Loss) Before Income Taxes 51,955 (12,324) 114,594 (299)
Operating profit impact of adverse change in costs on long-term mass transit test contracts 2,200   3,000 8,800
Aerospace        
Segment Reporting [Line Items]        
Sales 245,472 192,725 696,584 577,726
Test Systems Segment        
Segment Reporting [Line Items]        
Sales 26,207 18,722 65,671 44,335
Operating Segments, Excluding Intersegment Elimination | Aerospace        
Segment Reporting [Line Items]        
Sales 245,573 192,725 696,708 577,760
Operating Segments, Excluding Intersegment Elimination | Test Systems Segment        
Segment Reporting [Line Items]        
Sales 26,212 18,752 65,710 44,685
Less Inter-segment Sales | Aerospace        
Segment Reporting [Line Items]        
Sales (101) 0 (124) (34)
Less Inter-segment Sales | Test Systems Segment        
Segment Reporting [Line Items]        
Sales (5) (30) (39) (350)
Operating Segments        
Segment Reporting [Line Items]        
Total Operating Profit $ 61,410 $ 31,153 $ 146,001 $ 62,523
Operating Margins 22.60% 14.70% 19.20% 10.10%
Operating Segments | Aerospace        
Segment Reporting [Line Items]        
Sales $ 245,472 $ 192,725 $ 696,584 $ 577,726
Cost of Products Sold $ 159,726 $ 132,263 $ 457,993 $ 403,890
Cost of Products Sold Margins 65.10% 68.60% 65.70% 69.90%
Other Segment Items $ 28,187 $ 29,295 $ 97,436 $ 102,366
Total Operating Profit $ 57,559 $ 31,167 $ 141,155 $ 71,470
Operating Margins 23.40% 16.20% 20.30% 12.40%
Operating Segments | Test Systems Segment        
Segment Reporting [Line Items]        
Sales $ 26,207 $ 18,722 $ 65,671 $ 44,335
Cost of Products Sold $ 17,979 $ 14,673 $ 48,258 $ 39,984
Cost of Products Sold Margins 68.60% 78.40% 73.50% 90.20%
Other Segment Items $ 4,377 $ 4,063 $ 12,567 $ 13,298
Total Operating Profit $ 3,851 $ (14) $ 4,846 $ (8,947)
Operating Margins 14.70% (0.10%) 7.40% (20.20%)
Corporate Expenses and Other        
Deductions from Segment Measure of Operating Profit:        
Corporate Expenses and Other $ 7,617 $ 7,913 $ 24,901 $ 21,011