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Debt - 1.625% Senior Convertible Notes (2026 Notes) (Details)			1 Months Ended	12 Months Ended
	Mar. 06, 2023 USD ($) day $ / shares shares	Mar. 01, 2023	Mar. 22, 2017 USD ($)	Jun. 28, 2025 USD ($)	Jun. 29, 2024 USD ($)	Jul. 01, 2023 USD ($)	Jul. 02, 2022 USD ($)	Mar. 03, 2017 USD ($)
Debt Instrument [Line Items]
Convertible note settlement/modification						$ 10,100,000
Payments of debt issuance costs				$ 0	$ 0	$ 4,200,000
1.625% Senior Convertible Notes
Debt Instrument [Line Items]
Loss on convertible note debt modification	$ 14,600,000
1.625% Senior Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Interest rate on senior convertible notes	1.625%			1.625%
Face amount of senior convertible notes	$ 250,000,000
Proceeds from debt before debt issuance costs	118,000,000
Proceeds from issuance of debt	113,800,000
Payments of debt issuance costs	4,200,000
Loss on convertible note modification	2,200,000
Issuance costs	$ 2,000,000
Conversion rate (shares) | shares	75.7963
Initial conversion price (usd per share) | $ / shares	$ 13.19
Premium to closing sale price of common stock (percent)		22.50%
Incremental repurchase amount	$ 1,000
Threshold percentage of stock price trigger	130.00%
Debt conversion, trading days threshold | day	20
Threshold consecutive trading days (days) | day	30
Repurchase price (percent)	100.00%
Threshold principal amount	$ 75,000,000.0
Expected remaining term				8 months 12 days
1.625% Senior Convertible Notes | Convertible Debt | Debt Conversion Terms One
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	130.00%
Debt conversion, trading days threshold | day	20
Threshold consecutive trading days (days) | day	30
1.625% Senior Convertible Notes | Convertible Debt | Debt Conversion Terms Two
Debt Instrument [Line Items]
Debt conversion, trading days threshold | day	10
Trading day period	45 days
1.625% Senior Convertible Notes | Convertible Debt | Debt Conversion Terms Three
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	10.00%
1.625% Senior Convertible Notes | Convertible Debt | Debt Conversion Terms Four
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	98.00%
Debt conversion, trading days threshold | day	5
Threshold consecutive trading days (days) | day	10
1.625% Senior Convertible Notes | Convertible Debt | Exchange Transaction
Debt Instrument [Line Items]
Debt issued	$ 132,000,000
Repayments of debt	127,500,000
Convertible note settlement/modification	$ 10,100,000
1.00% Senior Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Interest rate on senior convertible notes	1.00%							1.00%
Face amount of senior convertible notes			$ 60,000,000					$ 400,000,000
Debt issued							$ 236,100,000
Payments of debt issuance costs			$ 8,900,000
Issuance costs	$ 300,000

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Debt Instrument, Convertible, Threshold Aggregate Principal Amount

+ References

No definition available.

+ Details

Name:	viav_DebtInstrumentConvertibleThresholdAggregatePrincipalAmount
Namespace Prefix:	viav_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Debt Instrument, Convertible, Threshold Premium Of Stock Price Trigger

+ References

No definition available.

+ Details

Name:	viav_DebtInstrumentConvertibleThresholdPremiumOfStockPriceTrigger
Namespace Prefix:	viav_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt Instrument, Convertible, Trading Day Period

+ References

No definition available.

+ Details

Name:	viav_DebtInstrumentConvertibleTradingDayPeriod
Namespace Prefix:	viav_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt Instrument, Expected Remaining Term

+ References

No definition available.

+ Details

Name:	viav_DebtInstrumentExpectedRemainingTerm
Namespace Prefix:	viav_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Gain (Loss) on Induced Conversion and Extinguishment of Debt

+ References

No definition available.

+ Details

Name:	viav_GainLossOnInducedConversionAndExtinguishmentOfDebt
Namespace Prefix:	viav_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Gain (Loss) On Modification Of Debt

+ References

No definition available.

+ Details

Name:	viav_GainLossOnModificationOfDebt
Namespace Prefix:	viav_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Proceeds From Convertible Debt, Before Debt Issuance Costs

+ References

No definition available.

+ Details

Name:	viav_ProceedsFromConvertibleDebtBeforeDebtIssuanceCosts
Namespace Prefix:	viav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_DebtInstrumentAxis=viav_SeniorOnePointSixTwoFivePercentConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	viav_DebtInstrumentConvertibleTermsOfConversionAxis=viav_DebtConversionTermsOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	viav_DebtInstrumentConvertibleTermsOfConversionAxis=viav_DebtConversionTermsTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	viav_DebtInstrumentConvertibleTermsOfConversionAxis=viav_DebtConversionTermsThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	viav_DebtInstrumentConvertibleTermsOfConversionAxis=viav_DebtConversionTermsFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=viav_ExchangeTransactionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=viav_SeniorOnePercentConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: