Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Shares	Common Stock	Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Beginning Balance, shares (in shares) at Jun. 30, 2018			75,693,000	0			(12,396,000)
Beginning Balance at Jun. 30, 2018	$ 1,024,311		$ 351,761	$ 0	$ (3,780)	$ 836,064	$ (159,734)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation activities (in shares)			(622,000)				(158,000)
Share-based and deferred compensation activities	23,438		$ 30,662				$ (7,224)
Purchases of treasury stock (in shares)							(50,000)
Purchases of treasury stock	(1,616)						$ (1,616)
Net earnings (loss)	107,517					107,517
Foreign currency translation adjustments	(14,319)				(14,319)
Change in fair value of interest rate swap	0
Pension adjustment, net of taxes	(6,122)				(6,122)
Ending Balance, shares (in shares) at Jun. 30, 2019			76,315,000	0			(12,604,000)
Ending Balance at Jun. 30, 2019	1,133,209		$ 382,423	$ 0	(24,221)	943,581	$ (168,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation activities (in shares)			(2,888,000)				(702,000)
Share-based and deferred compensation activities	$ 87,703		$ 116,817				$ (29,114)
Purchases of treasury stock (in shares)	(50,000)						(50,000)
Purchases of treasury stock	$ (1,625)						$ (1,625)
Shares issued related to Finisar acquisition (in shares)			26,713,000
Shares issued related to Finisar acquisition	987,707		$ 987,707
Net earnings (loss)	(67,029)					(67,029)
Foreign currency translation adjustments	(15,969)				(15,969)
Change in fair value of interest rate swap	(44,085)				(44,085)
Pension adjustment, net of taxes	(3,108)				(3,108)
Ending Balance, shares (in shares) at Jun. 30, 2020			105,916,000	0			(13,356,000)
Ending Balance at Jun. 30, 2020	2,076,803		$ 1,486,947	$ 0	(87,383)	876,552	$ (199,313)
Ending balance (in shares) at Jun. 30, 2020		0
Ending balance at Jun. 30, 2020	0	$ 0
Mezzanine Equity
Beginning balance (in shares)		0
Share-based and deferred compensation activities (in shares)			(2,512,000)				(284,000)
Share-based and deferred compensation activities	$ 83,584		$ 102,737				$ (19,153)
Purchases of treasury stock (in shares)	(1,416,587)
Purchases of treasury stock	$ (22,000)
Net earnings (loss)	297,552					297,552
Stock issues in underwritten public offering (in shares)			10,698,000	2,300,000
Shares issued in underwritten public offering	883,908		$ 438,589	$ 445,319
Accretion to redemption value of Series B shares issued in March 2021	(508)					(508)
Foreign currency translation adjustments	86,991				86,991
Change in fair value of interest rate swap	12,312				12,312
Pension adjustment, net of taxes	2,347				2,347
Dividends	(36,819)					(36,819)
Ending Balance, shares (in shares) at Jun. 30, 2021			119,127,000	2,300,000			(13,640,000)
Ending Balance at Jun. 30, 2021	3,406,170		$ 2,028,273	$ 445,319	$ 14,267	$ 1,136,777	$ (218,466)
Mezzanine Equity
Series B shares issued in March 2021 (in shares)		75,000
Series B shares issued in March 2021		$ 716,087
Accretion to redemption value of Series B shares issued in March 2021		508
Dividends		$ 9,583
Ending balance (in shares) at Jun. 30, 2021		75,000
Ending balance at Jun. 30, 2021	$ 726,178	$ 726,178
Mezzanine Equity
Beginning balance (in shares)		75,000