Goodwill and Other Intangible Assets - Purchase Price Allocation of Intangible Assets Acquired Other Than Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (146,477)	$ (102,516)
Net Book Value	763,456	139,324
Finisar Corporation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	669,700
Accumulated Amortization	(32,775)
Net Book Value	636,925
Technology and Patents
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	(59,222)	(39,679)
Net Book Value	367,812	51,958
Technology and Patents | Finisar Corporation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	334,700
Accumulated Amortization	(14,058)
Net Book Value	$ 320,642
Weighted Average Remaining Amortization Period (Years)	12 years
Trade Names
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (3,000)	(1,601)
Net Book Value	19,367	14,158
Trade Names | Finisar Corporation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,700
Accumulated Amortization	(1,301)
Net Book Value	$ 5,399
Weighted Average Remaining Amortization Period (Years)	2 years 6 months
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (82,687)	(59,664)
Net Book Value	376,277	$ 73,208
Customer Lists | Finisar Corporation
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	328,300
Accumulated Amortization	(17,416)
Net Book Value	$ 310,884
Weighted Average Remaining Amortization Period (Years)	9 years 4 months 24 days