Business Segments - Schedule of Information for Business Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net sales	$ 6,115.4	$ 5,670.0	$ 5,635.5
Costs and expenses
Cost of sales	3,500.6	3,235.2	3,196.1
Selling, general and administrative	931.1	902.6	852.0
Research and development	317.3	292.6	356.3
Acquired intangible asset amortization	216.6	198.0	196.7
Impairment of acquired intangible assets	0.0	52.5	0.0
Operating income (loss)	1,149.8	989.1	1,034.4
Reconciliation to Income (loss) before income taxes
Interest and debt expense, net	(59.6)	(57.9)	(77.3)
Non-service retirement benefit income	10.9	10.8	12.4
Gain (loss) on debt extinguishment	15.0	0.0	1.6
Other income (expense), net	(21.6)	(4.1)	(12.2)
Income (loss) before income taxes	1,094.5	937.9	958.9
Operating Segments
Segment Reporting Information [Line Items]
Net sales	6,115.4	5,670.0	5,635.5
Costs and expenses
Cost of sales	3,500.6	3,235.2	3,196.1
Selling, general and administrative	843.6	824.8	786.4
Research and development	317.3	292.6	356.3
Acquired intangible asset amortization	216.6	198.0	196.7
Impairment of acquired intangible assets		52.5
Operating income (loss)	1,237.3	1,066.9	1,100.0
Corporate expense
Costs and expenses
Operating income (loss)	(87.5)	(77.8)	(65.6)
Inter-segment eliminations
Segment Reporting Information [Line Items]
Net sales	23.3	24.6	29.4
Digital Imaging
Segment Reporting Information [Line Items]
Net sales	3,163.9	3,070.8	3,144.1
Digital Imaging \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	3,163.9	3,070.8	3,144.1
Costs and expenses
Cost of sales	1,771.4	1,708.0	1,711.4
Selling, general and administrative	491.5	510.7	489.6
Research and development	187.5	177.3	244.0
Acquired intangible asset amortization	185.3	183.3	181.7
Impairment of acquired intangible assets		49.5
Operating income (loss)	528.2	442.0	517.4
Instrumentation
Segment Reporting Information [Line Items]
Net sales	1,457.1	1,382.6	1,326.2
Instrumentation \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,457.1	1,382.6	1,326.2
Costs and expenses
Cost of sales	742.5	706.4	692.6
Selling, general and administrative	201.9	196.4	188.2
Research and development	99.4	92.6	92.9
Acquired intangible asset amortization	12.9	13.9	14.2
Impairment of acquired intangible assets		3.0
Operating income (loss)	400.4	370.3	338.3
Aerospace and Defense Electronics
Segment Reporting Information [Line Items]
Net sales	1,058.7	776.8	726.5
Aerospace and Defense Electronics \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,058.7	776.8	726.5
Costs and expenses
Cost of sales	624.6	441.3	424.6
Selling, general and administrative	123.8	91.2	83.7
Research and development	29.8	21.8	17.8
Acquired intangible asset amortization	18.4	0.8	0.8
Impairment of acquired intangible assets		0.0
Operating income (loss)	262.1	221.7	199.6
Engineered Systems
Segment Reporting Information [Line Items]
Net sales	435.7	439.8	438.7
Engineered Systems \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	435.7	439.8	438.7
Costs and expenses
Cost of sales	362.1	379.5	367.5
Selling, general and administrative	26.4	26.5	24.9
Research and development	0.6	0.9	1.6
Acquired intangible asset amortization	0.0	0.0	0.0
Impairment of acquired intangible assets		0.0
Operating income (loss)	$ 46.6	$ 32.9	$ 44.7

TELEDYNE TECHNOLOGIES INC 10-K