Property Plant and Equipment (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
Property Plant And Equipment [Abstract]
Accumulated depreciation of finance lease right-of-use asset	$ 4.6	$ 4.2

Accumulated depreciation of finance lease right-of-use asset.

No definition available.

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