Revenue from Contracts with Customers - Summary of Disaggregated Revenue by Revenue Market and Product (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 666,331	$ 342,839	$ 1,006,740	$ 657,272
Compound Semiconductors
Disaggregation Of Revenue [Line Items]
Revenue	205,938	183,145	382,940	362,422
Photonic Solutions
Disaggregation Of Revenue [Line Items]
Revenue	460,393	159,694	601,749	294,850
Unallocated & Other
Disaggregation Of Revenue [Line Items]
Revenue			22,051
Commercial | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	617,101	298,663	909,685	576,895
Commercial | Services
Disaggregation Of Revenue [Line Items]
Revenue	4,437
Commercial | Services
Disaggregation Of Revenue [Line Items]
Revenue		4,618	11,140	10,404
Commercial | Compound Semiconductors | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	157,848	140,698	288,036	285,565
Commercial | Compound Semiconductors | Services
Disaggregation Of Revenue [Line Items]
Revenue	3,297
Commercial | Compound Semiconductors | Services
Disaggregation Of Revenue [Line Items]
Revenue		2,889	8,989	6,884
Commercial | Photonic Solutions | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	459,253	157,965	599,598	291,330
Commercial | Photonic Solutions | Services
Disaggregation Of Revenue [Line Items]
Revenue	1,140
Commercial | Photonic Solutions | Services
Disaggregation Of Revenue [Line Items]
Revenue		1,729	2,151	3,520
Commercial | Unallocated & Other | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue			22,051
U.S. Government | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	40,165	33,507	77,247	60,687
U.S. Government | Services
Disaggregation Of Revenue [Line Items]
Revenue	4,628	6,051	8,668	9,286
U.S. Government | Compound Semiconductors | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	40,165	33,507	77,247	60,687
U.S. Government | Compound Semiconductors | Services
Disaggregation Of Revenue [Line Items]
Revenue	$ 4,628	$ 6,051	$ 8,668	$ 9,286