Revenue from Contracts with Customers - Summary of Disaggregated Revenue by Market and Product (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 728,084	$ 340,409
Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	22,051
Compound Semiconductors | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	230,357	177,001
Photonic Solutions | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	497,727	141,357
Commercial | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenues	674,843	292,584
Commercial | Direct Ship Parts | Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	22,051
Commercial | Services
Disaggregation of Revenue [Line Items]
Revenues	7,876	6,703
Commercial | Services | Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Commercial | Compound Semiconductors | Direct Ship Parts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	180,915	130,188
Commercial | Compound Semiconductors | Services | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	4,077	5,691
Commercial | Photonic Solutions | Direct Ship Parts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	493,928	140,345
Commercial | Photonic Solutions | Services | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,799	1,012
U.S. Government | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenues	36,488	37,082
U.S. Government | Direct Ship Parts | Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
U.S. Government | Services
Disaggregation of Revenue [Line Items]
Revenues	8,877	4,040
U.S. Government | Services | Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
U.S. Government | Compound Semiconductors | Direct Ship Parts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	36,488	37,082
U.S. Government | Compound Semiconductors | Services | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	8,877	4,040
U.S. Government | Photonic Solutions | Direct Ship Parts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	0	0
U.S. Government | Photonic Solutions | Services | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0