Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	3 Months Ended
	Sep. 30, 2018 USD ($)
Goodwill [Line Items]
Balance-beginning of period	$ 270,678
Goodwill acquired	28,845
Foreign currency translation	(1,215)
Balance-end of period	298,308
II-VI Laser Solutions
Goodwill [Line Items]
Balance-beginning of period	103,390
Segment Realignment	(4,653)
Foreign currency translation	(35)
Balance-end of period	98,702
II-VI Photonics
Goodwill [Line Items]
Balance-beginning of period	114,398
Goodwill acquired	24,844
Segment Realignment	(4,728)
Foreign currency translation	(1,180)
Balance-end of period	133,334
II- VI Performance Products
Goodwill [Line Items]
Balance-beginning of period	52,890
Goodwill acquired	4,001
Segment Realignment	9,381
Balance-end of period	$ 66,272