Condensed Consolidated Statements of Earnings (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Revenues	$ 1,434,665	$ 1,131,434	$ 2,782,800	$ 2,184,517
Costs, Expenses, and Other Expense (Income)
Cost of goods sold	925,314	780,793	1,813,317	1,526,981
Research and development	143,852	111,163	275,454	224,651
Selling, general and administrative	220,612	209,163	449,580	420,860
Restructuring charges (recoveries)	8,021	(1,570)	32,385	1,448
Interest expense	64,278	74,678	130,922	147,936
Other income, net	(55,816)	(5,386)	(66,565)	(11,655)
Total Costs, Expenses, & Other Expense	1,306,261	1,168,841	2,635,093	2,310,221
Earnings (Loss) Before Income Taxes	128,404	(37,407)	147,707	(125,704)
Income Tax Expense (Benefit)	26,862	(8,932)	21,304	(29,695)
Net Earnings (Loss)	101,542	(28,475)	126,403	(96,009)
Net Loss Attributable to Noncontrolling Interests	(1,843)	(1,484)	(2,869)	(1,484)
Net Earnings (Loss) Attributable to Coherent Corp.	103,385	(26,991)	129,272	(94,525)
Less: Dividends on Preferred Stock	32,262	30,580	64,095	60,753
Net Earnings (Loss) Available to the Common Shareholders, Basic	71,123	(57,571)	65,177	(155,278)
Net Earnings (Loss) Available to the Common Shareholders, Diluted	$ 71,123	$ (57,571)	$ 65,177	$ (155,278)
Basic Earnings (Loss) Per Share (in usd per share)	$ 0.46	$ (0.38)	$ 0.42	$ (1.03)
Diluted Earnings (Loss) Per Share (in usd per share)	$ 0.44	$ (0.38)	$ 0.41	$ (1.03)