Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Goodwill [Roll Forward]
Balance-beginning of period	$ 319,778	$ 270,678
Goodwill acquired	919,192	51,638
Foreign currency translation	39	(2,538)
Balance-end of period	1,239,009	319,778
Photonic Solutions
Goodwill [Roll Forward]
Balance-beginning of period	134,057	109,670
Goodwill acquired	919,192	26,069
Foreign currency translation	(755)	(1,682)
Balance-end of period	1,052,494	134,057
Compound Semiconductors
Goodwill [Roll Forward]
Balance-beginning of period	185,721	161,008
Goodwill acquired	0	25,569
Foreign currency translation	794	(856)
Balance-end of period	$ 186,515	$ 185,721