CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2026	Jun. 29, 2025	Jun. 28, 2026	Jun. 29, 2025
Income Statement [Abstract]
Net sales	$ 1,662.5	$ 1,513.7	$ 3,222.6	$ 2,963.6
Costs and expenses
Cost of sales	924.4	869.1	1,810.7	1,699.5
Selling, general and administrative	258.7	229.4	496.1	463.3
Research and development	90.2	82.4	174.8	156.7
Acquired intangible asset amortization	56.0	54.6	113.6	106.6
Total costs and expenses	1,329.3	1,235.5	2,595.2	2,426.1
Operating income (loss)	333.2	278.2	627.4	537.5
Interest and debt income (expense), net	(13.6)	(17.6)	(25.9)	(34.9)
Non-service retirement benefit income (expense), net	2.6	2.7	5.3	5.5
Other income (expense), net	(0.9)	(2.7)	(6.8)	(8.6)
Income (loss) before income taxes	321.3	260.6	600.0	499.5
Provision (benefit) for income taxes	69.6	50.2	121.5	100.3
Net income (loss) including noncontrolling interest	251.7	210.4	478.5	399.2
Less: Net income (loss) attributable to noncontrolling interest	0.0	0.5	0.0	0.7
Net income (loss) attributable to Teledyne	$ 251.7	$ 209.9	$ 478.5	$ 398.5
Basic earnings per common share (in USD per share)	$ 5.44	$ 4.48	$ 10.33	$ 8.51
Weighted average common shares outstanding (in shares)	46.3	46.9	46.3	46.8
Diluted earnings per common share (in USD per share)	$ 5.37	$ 4.43	$ 10.20	$ 8.41
Weighted average diluted common shares outstanding (in shares)	46.9	47.4	46.9	47.4