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Condensed Consolidated Statement of Shareholders' Equity (Unaudited) (Parenthetical) $ in Thousands	9 Months Ended
	Mar. 31, 2018 USD ($)
Statement Of Stockholders Equity [Abstract]
Debt issuance costs	$ 1,694

X

- Definition

Adjustments to additional paid in capital, debt issued, issuance costs.

+ References

No definition available.

+ Details

Name:	iivi_AdjustmentsToAdditionalPaidInCapitalDebtIssuedIssuanceCosts
Namespace Prefix:	iivi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration