CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Income Statement [Abstract]
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
Total costs and expenses	4,965.6	4,680.9	4,601.1
Operating income (loss)	1,149.8	989.1	1,034.4
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
Provision (benefit) for income taxes	198.8	117.2	72.3
Net income (loss) including noncontrolling interest	895.7	820.7	886.6
Less: Net income (loss) attributable to noncontrolling interest	0.9	1.5	0.9
Net income (loss) attributable to Teledyne	$ 894.8	$ 819.2	$ 885.7
Basic earnings per common share (in USD per share)	$ 19.12	$ 17.43	$ 18.80
Weighted average common shares outstanding (in shares)	46.8	47.0	47.1
Diluted earnings per common share (in USD per share)	$ 18.88	$ 17.21	$ 18.49
Weighted average diluted common shares outstanding (in shares)	47.4	47.6	47.9