Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Line Items]
Balance-beginning of period	$ 233,755
Foreign currency translation	(1,242)
Balance-end of period	232,513
II-VI Laser Solutions
Goodwill [Line Items]
Balance-beginning of period	84,105
Foreign currency translation	(100)
Balance-end of period	84,005
II-VI Photonics
Goodwill [Line Items]
Balance-beginning of period	96,760
Foreign currency translation	(1,142)
Balance-end of period	95,618
II- VI Performance Products
Goodwill [Line Items]
Balance-beginning of period	52,890
Balance-end of period	$ 52,890