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Business Segments - Schedule of Identifiable Assets (Details) - USD ($)
$ in Millions
Mar. 29, 2026
Dec. 28, 2025
Segment Reporting Information [Line Items]    
Total Teledyne identifiable assets $ 15,493.0 $ 15,285.3
Operating Segments    
Segment Reporting Information [Line Items]    
Total Teledyne identifiable assets 14,910.7 14,779.9
Operating Segments | Digital Imaging    
Segment Reporting Information [Line Items]    
Total Teledyne identifiable assets 11,325.2 11,303.3
Operating Segments | Instrumentation    
Segment Reporting Information [Line Items]    
Total Teledyne identifiable assets 1,870.9 1,794.3
Operating Segments | Aerospace and Defense Electronics    
Segment Reporting Information [Line Items]    
Total Teledyne identifiable assets 1,509.3 1,498.2
Operating Segments | Engineered Systems    
Segment Reporting Information [Line Items]    
Total Teledyne identifiable assets 205.3 184.1
Corporate    
Segment Reporting Information [Line Items]    
Total Teledyne identifiable assets $ 582.3 $ 505.4