Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2015	Jun. 30, 2014
Goodwill [Line Items]
Balance-beginning of period	$ 196,145
Foreign currency translation	(511)
Balance-end of period	195,634
II-VI Laser Solutions
Goodwill [Line Items]
Balance-beginning of period	44,041
Foreign currency translation	(567)
Balance-end of period	43,474
II-VI Photonics
Goodwill [Line Items]
Balance-beginning of period	99,214
Foreign currency translation	56
Balance-end of period	99,270
II- VI Performance Products
Goodwill [Line Items]
Balance-beginning of period		52,890
Balance-end of period	$ 52,890	$ 52,890