Earnings Per Share - Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Add back interest on II-VI Notes Due 2022
Net earnings (loss)	$ 82,294	$ 81,092	$ 87,900	$ 46,266	$ 51,261	$ 5,921	$ (98,213)	$ (25,998)	$ 297,552	$ (67,029)	$ 107,517
Deduct preferred stock dividends									(37,231)	0	0
Net Earnings (Loss) available to the Common Shareholder									260,321	(67,029)	107,517
Add back interest on Convertible Senior Notes Due 2022									12,264	0	0
Net earnings (loss) available to Common Shareholders									$ 272,585	$ (67,029)	$ 107,517
Denominator
Weighted average shares (in shares)									104,151	84,828	63,584
Effect of dilutive securities:
Stock options, performance and restricted shares (in shares)									3,552	0	2,220
Diluted weighted average common shares (in shares)									115,034	84,828	65,804
Basic earnings (loss) per common share (in usd per share)	$ 0.62	$ 0.71	$ 0.78	$ 0.39	$ 0.56	$ 0.07	$ (1.08)	$ (0.39)	$ 2.50	$ (0.79)	$ 1.69
Diluted earnings per common share (in usd per share)	$ 0.59	$ 0.66	$ 0.73	$ 0.38	$ 0.53	$ 0.06	$ (1.08)	$ (0.39)	$ 2.37	$ (0.79)	$ 1.63
II-VI Notes due 2022
Effect of dilutive securities:
II-VI Notes due 2022 (in shares)									7,331	0	0
Series A Preferred Stock
Add back interest on II-VI Notes Due 2022
Deduct preferred stock dividends									$ (27,140)	$ 0	$ 0
Series B Convertible Preferred Stock
Add back interest on II-VI Notes Due 2022
Deduct preferred stock dividends									(9,583)	0	0
Deduct Series B redeemable preferred deemed dividend									$ (508)	$ 0	$ 0