Condensed Consolidated Statements of Earnings (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Revenues	$ 1,497,879	$ 1,208,809	$ 4,280,679	$ 3,393,326
Costs, Expenses, and Other Expense (Income)
Cost of goods sold	970,189	842,322	2,783,506	2,369,303
Research and development	150,731	127,485	426,185	352,136
Selling, general and administrative	231,439	205,167	681,019	626,027
Restructuring charges	73,769	11,530	106,154	12,978
Interest expense	57,284	72,753	188,206	220,689
Other (income) expense, net	4,577	(18,597)	(61,988)	(30,252)
Total Costs, Expenses, & Other Expense	1,487,989	1,240,660	4,123,082	3,550,881
Earnings (Loss) Before Income Taxes	9,890	(31,851)	157,597	(157,555)
Income Tax Expense (Benefit)	8,125	(16,121)	29,429	(45,816)
Net Earnings (Loss)	1,765	(15,730)	128,168	(111,739)
Net Loss Attributable to Noncontrolling Interests	(13,946)	(2,543)	(16,815)	(4,027)
Net Earnings (Loss) Attributable to Coherent Corp.	15,711	(13,187)	144,983	(107,712)
Less: Dividends on Preferred Stock	32,693	31,193	96,788	91,946
Net Earnings (Loss) Available to the Common Shareholders, Basic	(16,982)	(44,380)	48,195	(199,658)
Net Earnings (Loss) Available to the Common Shareholders, Diluted	$ (16,982)	$ (44,380)	$ 48,195	$ (199,658)
Basic Earnings (Loss) Per Share (in usd per share)	$ (0.11)	$ (0.29)	$ 0.31	$ (1.32)
Diluted Earnings (Loss) Per Share (in usd per share)	$ (0.11)	$ (0.29)	$ 0.30	$ (1.32)