Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Beginning Balance, shares (in shares) at Jun. 30, 2019		76,315,000				(12,604,000)
Beginning Balance at Jun. 30, 2019	$ 1,133,209	$ 382,423		$ (24,221)	$ 943,581	$ (168,574)
Share-based and deferred compensation activities(in shares)		(708,000)				(251,000)
Share-based and deferred compensation activities	49,211	$ 59,043				$ (9,832)
Shares issued and related to Finisar acquisitions (in shares)		26,713,000
Shares issued and related to Finisar acquisition	987,707	$ 987,707
Net earnings (loss)	(25,998)				(25,998)
Foreign currency translation adjustments	(13,019)			(13,019)
Change in fair value of interest rate swap, net of taxes of ($152)	0
Pension adjustment, net of taxes	84			84
Ending Balance, shares (in shares) at Sep. 30, 2019		103,736,000				(12,855,000)
Ending Balance at Sep. 30, 2019	2,131,194	$ 1,429,173		(37,156)	917,583	$ (178,406)
Beginning Balance, shares (in shares) at Jun. 30, 2020		105,916,000	0			(13,356,000)
Beginning Balance at Jun. 30, 2020	2,076,803	$ 1,486,947	$ 0	(87,383)	876,552	$ (199,313)
Share-based and deferred compensation activities(in shares)		(575,000)				(120,000)
Share-based and deferred compensation activities	11,266	$ 16,764				$ (5,498)
Shares issued in July 2020 underwritten public offering (in shares)		10,698,000	2,300,000
Shares issued in July 2020 underwritten public offering	883,908	$ 438,589	$ 445,319
Net earnings (loss)	46,266				46,266
Foreign currency translation adjustments	35,524			35,524
Change in fair value of interest rate swap, net of taxes of ($152)	(555)			(555)
Dividends	(6,535)
Pension adjustment, net of taxes	0
Ending Balance, shares (in shares) at Sep. 30, 2020		117,189,000	2,300,000			(13,476,000)
Ending Balance at Sep. 30, 2020	$ 3,046,677	$ 1,942,300	$ 445,319	$ (52,414)	$ 916,283	$ (204,811)