Property Plant and Equipment - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Property, Plant and Equipment [Abstract]
Finance lease, right-of-use asset, accumulated amortization	$ 5.4	$ 4.2

Finance Lease, Right-of-Use Asset, Accumulated Amortization

No definition available.

Name:	iivi_FinanceLeaseRightOfUseAssetAccumulatedAmortization
Namespace Prefix:	iivi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant