Acquisitions (Unaudited Pro-Forma Consolidated Results Of Operations) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Business Acquisition [Line Items]
Net revenues	$ 534,630	$ 533,295
Net earnings attributable to II-VI Incorporated	$ 60,306	$ 86,322
Basic earnings per share	$ 0.96	$ 1.39
Diluted earnings per share	$ 0.94	$ 1.36