Revenue from Contracts with Customers - Summary of Disaggregated Revenue by Revenue Market and Product (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 627,041	$ 342,496	$ 1,633,781	$ 999,768
Compound Semiconductors
Disaggregation of Revenue [Line Items]
Revenue	209,272	176,023	592,212	538,445
Photonic Solutions
Disaggregation of Revenue [Line Items]
Revenue	417,769	166,473	1,019,518	461,323
Unallocated & Other
Disaggregation of Revenue [Line Items]
Revenue	0	0	22,051	0
Commercial | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenue	567,608	308,075	1,466,674	884,970
Commercial | Services
Disaggregation of Revenue [Line Items]
Revenue	15,244	5,014	37,002	15,418
Commercial | Compound Semiconductors | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenue	155,048	144,001	435,095	429,566
Commercial | Compound Semiconductors | Services
Disaggregation of Revenue [Line Items]
Revenue	10,035	2,615	27,012	9,499
Commercial | Photonic Solutions | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenue	412,560	164,074	1,009,528	455,404
Commercial | Photonic Solutions | Services
Disaggregation of Revenue [Line Items]
Revenue	5,209	2,399	9,990	5,919
Commercial | Unallocated & Other | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenue	0	0	22,051	0
U.S. Government | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenue	39,293	27,144	116,541	87,831
U.S. Government | Services
Disaggregation of Revenue [Line Items]
Revenue	4,896	2,263	13,564	11,549
U.S. Government | Compound Semiconductors | Direct Ship Parts
Disaggregation of Revenue [Line Items]
Revenue	39,293	27,144	116,541	87,831
U.S. Government | Compound Semiconductors | Services
Disaggregation of Revenue [Line Items]
Revenue	$ 4,896	$ 2,263	$ 13,564	$ 11,549