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Schedule of Changes in Projected Benefit Obligations and Plan Assets (Parenthetical) (Detail) | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Postemployment Benefits [Abstract] |  |
Defined benefit plan conversion rate | 6.20% | 6.80%

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- Definition Defined benefit plan conversion rate. + References No definition available. + Details
Name: | iivi_DefinedBenefitPlanConversionRate
Namespace Prefix: | iivi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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