Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Contributions to profit sharing retirement plan	$ 3,400	$ 2,800	$ 2,500
Common stock discount percentage from the prevailing market price	5.00%
Percentage of maximum employee subscription rate on base pay	10.00%
Contributions to the Compensation Plan by the employer	$ 2,043	1,914
Contributions to the Compensation Plan by the employer in fiscal year 2017	2,500
Underfunded pension liability	$ 18,237	10,066
Percentage of discretionary incentive compensation	100.00%
Contributions to the Compensation Plan by the employees	$ 1,200	700	1,900
II-VI Performance Metals Defined Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions to the Compensation Plan by the employer	$ 0	$ 0	$ 0
Employee Stock
Defined Benefit Plan Disclosure [Line Items]
Common stock authorized for issuance under the Plan	1,600,000
Common stock available for purchase under the plan	492,913	514,031