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

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- Definition Accumulated depreciation of finance lease right-of-use asset. + References No definition available. + Details
Name: | iivi_AccumulatedDepreciationOfFinanceLeaseRightOfUseAsset
Namespace Prefix: | iivi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration