Segment Reporting - Financial Information of Company's Operation by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 728,084	$ 340,409
Inter-segment revenues	0	0
Operating income (loss)	101,130	(18,475)
Interest expense	(17,214)	(6,968)
Other income (expense), net	(24,339)	(5,079)
Income taxes	(13,311)	4,524
Net earnings (loss)	46,266	(25,998)
Depreciation and amortization	64,685	26,948
Expenditures for property, plant & equipment	33,792	25,636
Segment assets	5,470,619		$ 5,234,714
Goodwill	1,254,338		1,239,009
Unallocated & Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	0	22,051
Inter-segment revenues	(74,303)	(16,583)
Operating income (loss)	0	(58,019)
Interest expense	0	0
Other income (expense), net	0	0
Income taxes	0	0
Net earnings (loss)	0	0
Depreciation and amortization	0	3,743
Expenditures for property, plant & equipment	0	2,764
Segment assets	0
Goodwill	0
Photonic Solutions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	205,188		186,515
Photonic Solutions | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	497,727	141,357
Inter-segment revenues	7,216	2,650
Operating income (loss)	50,435	13,024
Interest expense	0	0
Other income (expense), net	0	0
Income taxes	0	0
Net earnings (loss)	0	0
Depreciation and amortization	38,687	6,816
Expenditures for property, plant & equipment	21,234	9,389
Segment assets	3,586,125
Goodwill	1,049,150
Compound Semiconductors
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	1,049,150		$ 1,052,494
Compound Semiconductors | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	230,357	177,001
Inter-segment revenues	67,087	13,933
Operating income (loss)	50,695	26,521
Interest expense	0	0
Other income (expense), net	0	0
Income taxes	0	0
Net earnings (loss)	0	0
Depreciation and amortization	25,998	16,389
Expenditures for property, plant & equipment	12,558	$ 13,483
Segment assets	1,884,494
Goodwill	$ 205,188