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Earnings (Loss) Per Share - Schedule of Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Numerator        
Net loss attributable to Coherent Corp. $ (13,187) $ 2,546 $ (107,712) $ (81,224)
Deduct Series A preferred stock dividends (31,193) (36,071) (91,946) (107,537)
Basic loss available to common shareholders (44,380) (33,525) (199,658) (188,761)
Diluted loss available to common shareholders $ (44,380) $ (33,525) $ (199,658) $ (188,761)
Denominator        
Diluted weighted average common shares (in shares) 152,138 139,113 151,341 136,990
Basic loss per common share (in usd per share) $ (0.29) $ (0.24) $ (1.32) $ (1.38)
Diluted loss per common share (in usd per share) $ (0.29) $ (0.24) $ (1.32) $ (1.38)
Deduct Series A preferred stock dividends        
Numerator        
Deduct Series A preferred stock dividends $ 0 $ (6,900) $ 0 $ (20,700)
Deduct Series B dividends and deemed dividends        
Numerator        
Deduct Series A preferred stock dividends (29,810) (27,969) (87,919) (83,267)
Deduct Series B dividends and deemed dividends $ (31,193) $ (29,171) $ (91,946) $ (86,837)