Goodwill and Other Intangible Assets - Purchase Price Allocation of Intangible Assets Acquired (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 924,477	$ 241,840
Accumulated Amortization	(166,109)	(102,516)
Net Book Value	758,368	139,324
Finisar Corporation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	665,200
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	444,315	91,637
Accumulated Amortization	(68,048)	(39,679)
Net Book Value	376,267	51,958
Technology | Finisar Corporation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 334,700
Finite-lived intangible assets useful life, years	12 years 6 months
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 22,369	15,759
Accumulated Amortization	(3,669)	(1,601)
Net Book Value	18,700	14,158
Trade Names | Finisar Corporation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,700
Finite-lived intangible assets useful life, years	3 years
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 456,223	132,872
Accumulated Amortization	(92,822)	(59,664)
Net Book Value	363,401	$ 73,208
Customer Lists | Finisar Corporation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 323,800
Finite-lived intangible assets useful life, years	10 years 2 months 12 days