Earnings Per Share - Schedule of Reconciliation of Basic and Diluted of Earnings (loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Numerator
Net earnings (loss) attributable to Coherent Corp.	$ (156,154)	$ (259,458)	$ 234,759
Deduct dividends	(123,357)	(144,212)	(68,225)
Net Earnings (Loss) Available to the Common Shareholders	(279,511)	(403,670)	166,534
Effect of dilutive securities:
Add back interest on Convertible Notes (net of tax)	0	0	2,229
Diluted earnings (loss) available to the common shareholders	$ (279,511)	$ (403,670)	$ 168,763
Denominator
Weighted average shares (in shares)	151,642	137,578	106,189
Effect of dilutive securities
Common stock equivalents (in shares)	0	0	3,012
Convertible Notes (in shares)	0	0	7,312
Diluted weighted average common shares (in shares)	151,642	137,578	116,513
Basic earnings (loss) per common share (in usd per share)	$ (1.84)	$ (2.93)	$ 1.57
Diluted earnings (loss) per common share (in usd per share)	$ (1.84)	$ (2.93)	$ 1.45
Series A Preferred Stock
Numerator
Deduct dividends	$ 0	$ (27,600)	$ (27,600)
Series B Convertible Preferred Stock
Numerator
Deduct dividends	$ (123,357)	$ (116,612)	$ (40,625)