Revenue from Contracts with Customers - Summary of Disaggregated Revenue by Market and Product (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 786,569	$ 666,331	$ 1,514,653	$ 1,006,740
Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	22,051
Photonic Solutions | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	482,879	460,393	980,606	601,749
Compound Semiconductors | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	303,690	205,938	534,047	382,940
Commercial | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenues	736,074	617,101	1,410,917	909,685
Commercial | Direct Ship Parts | Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	22,051
Commercial | Services
Disaggregation of Revenue [Line Items]
Revenues	9,070	4,437	16,946	11,140
Commercial | Services | Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Commercial | Photonic Solutions | Direct Ship Parts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	478,887	459,253	972,816	599,598
Commercial | Photonic Solutions | Services | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,992	1,140	7,790	2,151
Commercial | Compound Semiconductors | Direct Ship Parts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	257,187	157,848	438,102	288,036
Commercial | Compound Semiconductors | Services | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	5,078	3,297	9,155	8,989
U.S. Government | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenues	35,447	40,165	71,935	77,247
U.S. Government | Direct Ship Parts | Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
U.S. Government | Services
Disaggregation of Revenue [Line Items]
Revenues	5,978	4,628	14,855	8,668
U.S. Government | Services | Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
U.S. Government | Photonic Solutions | Direct Ship Parts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
U.S. Government | Photonic Solutions | Services | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
U.S. Government | Compound Semiconductors | Direct Ship Parts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	35,447	40,165	71,935	77,247
U.S. Government | Compound Semiconductors | Services | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 5,978	$ 4,628	$ 14,855	$ 8,668