Debt instrument maturity month and year.

No definition available.

Name:	iivi_DebtInstrumentMaturityMonthAndYear
Namespace Prefix:	iivi_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, month and year of extend maturity.

+ References

No definition available.

+ Details

Name:	iivi_DebtInstrumentMonthAndYearOfExtendMaturity
Namespace Prefix:	iivi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Date the first payment under the line of credit must be paid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityDateOfFirstRequiredPayment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the required periodic payment applied to interest.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityPeriodicPaymentInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of the required periodic payment applied to principal.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=iivi_SingaporeBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=iivi_TermLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=iivi_YenRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Additional Information (Detail)	12 Months Ended
Debt - Additional Information (Detail)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2015 JPY (¥)
Line Of Credit Facility [Line Items]
Available credit under lines of credit	$ 116,600,000	$ 71,000,000
Total outstanding letters of credit	$ 1,500,000	$ 1,500,000
Weighted average interest rate of borrowings	1.80%	1.80%		1.80%
Weighted average of total borrowings	$ 210,000,000	$ 222,600,000
Credit facility, interest paid	4,000,000	4,200,000	$ 1,100,000
Credit facility, commitment fees paid	4,000,000	4,200,000	$ 1,100,000
Singapore Bank
Line Of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	300,000	300,000
Total outstanding letters of credit	$ 0	$ 0
Weighted average interest rate of borrowings	5.25%	5.25%		5.25%
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 225,000,000
Debt instrument, month and year of maturity	2018-09
Term Loans
Line Of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 100,000,000
Term loan, quarterly principal Payment	$ 5,000,000
Term loan, first quarterly principal payment commencement date	Oct. 01, 2013
Yen denominated line of credit
Line Of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 4,100,000			¥ 500,000,000
Debt instrument, month and year of maturity	2016-06
Debt instrument, month and year of extend maturity	2020-08
London Interbank Offered Rate (LIBOR) \| Term Loans
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	1.25%
London Interbank Offered Rate (LIBOR) \| Yen denominated line of credit
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	0.625%
Prime Rate \| Singapore Bank
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	1.00%	1.00%
Maximum \| London Interbank Offered Rate (LIBOR) \| Revolving Credit Facility
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	1.75%
Maximum \| London Interbank Offered Rate (LIBOR) \| Yen denominated line of credit
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	1.50%
Minimum \| London Interbank Offered Rate (LIBOR) \| Revolving Credit Facility
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	0.75%
Minimum \| London Interbank Offered Rate (LIBOR) \| Yen denominated line of credit
Line Of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	0.625%