Earnings (Loss) Per Share - Schedule of Reconciliation of Basic and Diluted of Earnings (loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Numerator
Net earnings (loss) attributable to Coherent Corp.	$ 103,385	$ (26,991)	$ 129,272	$ (94,525)
Deduct Series B dividends and deemed dividends	(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)
Denominator
Weighted average shares, basic (in shares)	154,767	151,564	154,197	150,946
Effect of dilutive securities:
Common stock equivalents (in shares)	5,222	0	5,078	0
Diluted weighted average common shares (in shares)	159,989	151,564	159,275	150,946
Basic earnings (loss) per common share (in usd per share)	$ 0.46	$ (0.38)	$ 0.42	$ (1.03)
Diluted earnings (loss) per common share (in usd per share)	$ 0.44	$ (0.38)	$ 0.41	$ (1.03)