Condensed Consolidated Statements of Earnings (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenues	$ 1,131,434	$ 1,370,285	$ 2,184,517	$ 2,714,855
Costs, Expenses, and Other Expense (Income)
Cost of goods sold	780,793	959,097	1,526,981	1,860,093
Internal research and development	111,163	128,791	224,651	249,875
Selling, general and administrative	209,163	274,151	420,860	554,165
Restructuring charges (recoveries)	(1,570)	0	1,448	0
Interest expense	74,678	70,904	147,936	132,793
Other (income) expense, net	(5,386)	3,696	(11,655)	35,301
Total Costs, Expenses, & Other Expense	1,168,841	1,436,639	2,310,221	2,832,227
Loss Before Income Taxes	(37,407)	(66,354)	(125,704)	(117,372)
Income Tax Benefit	(8,932)	(21,282)	(29,695)	(33,602)
Net Loss	(28,475)	(45,072)	(96,009)	(83,770)
Net Loss Attributable to Noncontrolling Interests	(1,484)	0	(1,484)	0
Net Loss Attributable to Coherent Corp.	(26,991)	(45,072)	(94,525)	(83,770)
Less: Dividends on Preferred Stock	30,580	35,889	60,753	71,466
Net Loss Available to the Common Shareholders	$ (57,571)	$ (80,961)	$ (155,278)	$ (155,236)
Basic loss per share (in usd per share)	$ (0.38)	$ (0.58)	$ (1.03)	$ (1.14)
Diluted loss per share (in usd per share)	$ (0.38)	$ (0.58)	$ (1.03)	$ (1.14)