Debt Instrument, Convertible Business Period

No definition available.

Name:	iivi_DebtInstrumentConvertibleBusinessPeriod
Namespace Prefix:	iivi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Convertible, Measurement Period

+ References

No definition available.

+ Details

Name:	iivi_DebtInstrumentConvertibleMeasurementPeriod
Namespace Prefix:	iivi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Convertible, Measurement Period Percentage

+ References

No definition available.

+ Details

Name:	iivi_DebtInstrumentConvertibleMeasurementPeriodPercentage
Namespace Prefix:	iivi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest coverage ratio.

+ References

No definition available.

+ Details

Name:	iivi_InterestCoverageRatio
Namespace Prefix:	iivi_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Letter of credit sub facility maximum borrowing capacity.

+ References

No definition available.

+ Details

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

- Definition

Leverage ratio.

+ References

No definition available.

+ Details

Name:	iivi_LeverageRatio
Namespace Prefix:	iivi_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of days prior to the maturity of outstanding.

+ References

No definition available.

+ Details

Name:	iivi_NumberOfDaysPriorToMaturityOfOutstanding
Namespace Prefix:	iivi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Swing loan sub facility maximum initial borrowing capacity.

+ References

No definition available.

+ Details

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

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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+ Details

Name:	us-gaap_AmortizationOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 7
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+ Details

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Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdTradingDays
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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-Paragraph 6
-Subparagraph (a)
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-Name Accounting Standards Codification
-Topic 210
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-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 45
-Paragraph 1A
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+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
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-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

+ Details

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

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

+ Details

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

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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-Topic 230
-SubTopic 10
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
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Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=iivi_ZeroPointFiveZeroFinisarConvertibleNotesMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=iivi_BankOfAmericaNAMember
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- Details

Name:	us-gaap_CreditFacilityAxis=iivi_SeniorSecuredCreditFacilityMember
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Period Type:

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Name:	us-gaap_CreditFacilityAxis=iivi_TermALoanFacilityMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=iivi_NewSeniorCreditFacilitiesMember
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- Details

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Period Type:

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Debt - Additional Information (Detail)			1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended
Debt - Additional Information (Detail)	Oct. 23, 2019 USD ($)	Sep. 24, 2019 USD ($)	Aug. 31, 2017 USD ($) d $ / shares	Mar. 31, 2021 USD ($) d	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) d	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)
Line of Credit Facility [Line Items]
Cash paid for interest							$ 17,963,000	$ 46,430,000
Available credit under lines of credit				$ 448,600,000			$ 448,600,000
Weighted average interest rate of total borrowings				1.50%			1.50%	3.70%
0.25% Convertible Senior Notes due 2022
Line of Credit Facility [Line Items]
Debt instrument, interest rate				0.25%			0.25%	0.25%
Aggregate principal amount			$ 345,000,000
Aggregate principal outstanding				$ 344,988,000			$ 344,988,000		$ 345,000,000
Debt instrument, conversion ratio			0.02125
Debt instrument conversion, conversion price per share (in usd per share) \| $ / shares			$ 47.06
Debt instrument conversion, If-converted value of notes					$ 346,200,000		$ 501,200,000
Debt instrument conversion, trading days \| d			20	20
Debt instrument conversion, consecutive trading days \| d			30	30
Debt instrument conversion, conversion price percentage			130.00%	130.00%
Debt instrument conversion, business day period			5 days
Debt instrument conversion, measurement period			5 days
Debt instrument conversion, measurement period percentage			98.00%
Effective interest rate				4.50%			4.50%		4.50%
Unamortized discount amount				$ 17,900,000			$ 17,900,000
0.50% Finisar Convertible Notes
Line of Credit Facility [Line Items]
Redemption price percentage		100.00%					100.00%
Debt instrument, interest rate				0.50%			0.50%
Aggregate principal amount		$ 560,100,000
Debt instrument, repurchase amount	$ 561,100,000
Aggregate principal outstanding				$ 14,900,000			$ 14,900,000
Bank of America, N.A.
Line of Credit Facility [Line Items]
Letter of credit sub-facility maximum borrowing capacity				25,000,000.0			25,000,000.0
Swing loan sub-facility maximum initial borrowing capacity				20,000,000.0			20,000,000.0
Senior Secured Credit Facility \| Bank of America, N.A.
Line of Credit Facility [Line Items]
Aggregate principal amount				2,425,000,000			2,425,000,000
Term A Loan Facility
Line of Credit Facility [Line Items]
Proceeds from term loan	$ 561,000,000.0
Aggregate principal outstanding				1,072,925,000			1,072,925,000		$ 1,194,463,000
Term A Loan Facility \| Bank of America, N.A.
Line of Credit Facility [Line Items]
Aggregate principal amount				1,255,000,000			$ 1,255,000,000
Debt agreement term							5 years
Redemption price percentage							1.25%
Term B Loan Facility
Line of Credit Facility [Line Items]
Aggregate principal amount				720,000,000			$ 720,000,000
Debt agreement term							7 years
Cash paid for interest							$ 600,000
Debt issuance costs						$ 24,700,000
Aggregate principal outstanding				0			0		714,600,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Aggregate principal outstanding				0			0		$ 74,000,000
Revolving Credit Facility \| Bank of America, N.A.
Line of Credit Facility [Line Items]
Aggregate principal amount				$ 450,000,000			$ 450,000,000
Debt agreement term							5 years
Senior Credit Facilities \| Fifth Fiscal Quarter Through Eighth Fiscal Quarter After Closing Date
Line of Credit Facility [Line Items]
Leverage ratio							4.50
Senior Credit Facilities \| Subsequent Fiscal Quarter
Line of Credit Facility [Line Items]
Leverage ratio							4.00
Senior Credit Facilities \| Minimum
Line of Credit Facility [Line Items]
Interest coverage ratio							3.00
Senior Credit Facilities \| Maximum \| First Four Fiscal Quarters After Closing Date
Line of Credit Facility [Line Items]
Leverage ratio							5.00
Senior Credit Facilities \| Federal Funds Rate
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate							0.50%
Senior Credit Facilities \| Eurodollar
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate							1.00%
Senior Credit Facilities \| 0.25% Convertible Senior Notes due 2022 \| I I V I Notes
Line of Credit Facility [Line Items]
Number of days prior to maturity of outstanding \| d							120
Debt instrument, interest rate				0.25%			0.25%