Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Goodwill [Line Items]
Balance-beginning of period	$ 233,755	$ 195,894
Goodwill acquired	17,107	75,900
Goodwill attributed to the RF business sold		(35,352)
Foreign currency translation	(520)	(2,687)
Balance-end of period	250,342	233,755
II-VI Laser Solutions
Goodwill [Line Items]
Balance-beginning of period	84,105	43,578
Goodwill acquired		75,900
Goodwill attributed to the RF business sold		(35,352)
Foreign currency translation	75	(21)
Balance-end of period	84,180	84,105
II-VI Photonics
Goodwill [Line Items]
Balance-beginning of period	96,760	99,426
Goodwill acquired	17,107
Foreign currency translation	(595)	(2,666)
Balance-end of period	113,272	96,760
II- VI Performance Products
Goodwill [Line Items]
Balance-beginning of period	52,890	52,890
Balance-end of period	$ 52,890	$ 52,890