Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Dec. 31, 2016 USD ($)
Goodwill [Line Items]
Balance-beginning of period	$ 233,755
Foreign currency translation	(1,439)
Balance-end of period	232,316
II-VI Laser Solutions
Goodwill [Line Items]
Balance-beginning of period	84,105
Foreign currency translation	(136)
Balance-end of period	83,969
II-VI Photonics
Goodwill [Line Items]
Balance-beginning of period	96,760
Foreign currency translation	(1,303)
Balance-end of period	95,457
II- VI Performance Products
Goodwill [Line Items]
Balance-beginning of period	52,890
Balance-end of period	$ 52,890