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Debt - Additional Information (Details)			1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 27, 2017	Aug. 21, 2013 USD ($) $ / shares	Mar. 31, 2017 USD ($)	Jun. 27, 2015 noteholder	Jul. 01, 2017 USD ($) d day $ / shares	Jul. 02, 2016 USD ($)	Jun. 27, 2015 USD ($)	Mar. 22, 2017 USD ($)	Mar. 03, 2017 USD ($)	Aug. 15, 2013
Debt
Short-term debt outstanding					$ 0	$ 0
Cash paid in debt repurchase					45,400,000	0	$ 0
Loss on extinguishment of debt					1,100,000	0	$ 0
Convertible Debt
Debt
Carrying value of the equity component of convertible debt					229,700,000	134,400,000
Unamortized debt issuance cost					$ 9,200,000	5,000,000
Convertible Debt | 1.00% Senior Convertible Notes
Debt
Interest rate on senior convertible notes					1.00%				1.00%
Aggregate principal amount of convertible debt								$ 60,000,000	$ 400,000,000
Total proceeds net of issuance costs			$ 451,100,000
Effective interest rate					4.80%
Initial conversion price (in dollars per share) | $ / shares					$ 13.22
Premium of initial conversion price over closing stock price	32.50%
Percentage of principal amount at which the entity may redeem some or all of the notes for cash					100.00%
Derivative term					7 years
Carrying value of the liability component					$ 358,100,000
Carrying value of the equity component of convertible debt					$ 101,900,000
Remaining term of convertible notes					6 years 8 months 12 days
Debt issuance costs incurred								8,900,000
Fair market value of convertible debt					$ 481,700,000
Amount outstanding					$ 460,000,000	0
Convertible Debt | 1.00% Senior Convertible Notes | Conversion criteria one
Debt
Percentage of the conversion price that the closing price of the entity's common stock must exceed in order for the notes to be convertible					130.00%
Number of trading days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable | day					20
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 trading days in order for the notes to be redeemable					30 days
Convertible Debt | 1.00% Senior Convertible Notes | Conversion criteria two
Debt
Number of trading days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable | d					45
Trading days used to calculate stock price trigger | d					10
Convertible Debt | 1.00% Senior Convertible Notes | Conversion criteria three
Debt
Threshold premium of stock price trigger					10.00%
Convertible Debt | 1.00% Senior Convertible Notes | Conversion criteria five
Debt
Percentage of the conversion price that the closing price of the entity's common stock must exceed in order for the notes to be convertible					98.00%
Number of consecutive business days immediately following any 10 consecutive trading day period					5 days
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 trading days in order for the notes to be redeemable					10 days
Convertible Debt | 1.00% Senior Convertible Notes, Liability Component
Debt
Debt issuance costs incurred								6,900,000
Unamortized debt issuance cost					$ 6,600,000
Convertible Debt | 1.00% Senior Convertible Notes, Equity Component
Debt
Debt issuance costs incurred								$ 2,000,000
Convertible Debt | 0.625% Senior Convertible Notes
Debt
Interest rate on senior convertible notes					0.625%
Aggregate principal amount of convertible debt		$ 650,000,000.0
Total proceeds net of issuance costs		$ 636,300,000
Effective interest rate		5.40%
Conversion price of debt (in dollars per share) | $ / shares		$ 18.83			$ 11.28
Conversion price of convertible debt as premium on closing price of common stock (as a percent)										40.00%
Principal amount used for debt instrument conversion		$ 1,000			$ 1,000
Number of consecutive business days immediately following any 10 consecutive trading day period					5 days
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 trading days in order for the notes to be redeemable					30 days
Number of consecutive trading days before five consecutive business-days					10 days
Percentage of principal amount at which the entity may redeem some or all of the notes for cash		100.00%
Number of note holders exercising conversion rights before expiration notice | noteholder				0
Percentage of principal amount that the holder of the note may require the entity to repurchase the debt instrument		100.00%
Discount rate used to calculate the carrying value of the liability component of the convertible debt (as a percent)		5.40%
Variable rate basis on which disclount rate is based		5 years
Carrying value of the liability component		$ 515,600,000
Carrying value of the equity component of convertible debt		134,400,000
Remaining term of convertible notes					1 year 1 month 6 days
Deferred finance costs		13,700,000
Liability component, debt issuance cost		10,900,000
Equity component, debt issuance cost		$ 2,800,000
Aggregate amount of debt repurchased					$ 40,000,000
Cash paid in debt repurchase					45,400,000
Loss on extinguishment of debt					1,100,000
Fair market value of convertible debt					676,100,000	633,000,000
Amount outstanding					610,000,000	$ 650,000,000
Convertible Debt | 0.625% Senior Convertible Notes | Other non-current assets
Debt
Unamortized portion of debt issuance cost					$ 2,600,000
Convertible Debt | 0.625% Senior Convertible Notes | Minimum
Debt
Percentage of the conversion price that the closing price of the entity's common stock must exceed in order for the notes to be convertible					130.00%
Number of trading days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable | d					20
Convertible Debt | 0.625% Senior Convertible Notes | Maximum
Debt
Percentage of the trading price to the closing sale price of the entity's common stock					98.00%

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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

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Gross amount of debt extinguished.

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Represents the amount of finance costs associated with the convertible debt issuance which is allocated to the equity component of the instrument.

+ References

No definition available.

+ Details

Name:	viav_DebtIssuanceExpenseAllocatedToEquityPortion
Namespace Prefix:	viav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair Value Inputs, Discount Period

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

+ References

No definition available.

+ Details

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Namespace Prefix:	viav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number Of Note Holders Exercising Conversion Rights Before Expiration Notice

+ References

No definition available.

+ Details

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Namespace Prefix:	viav_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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- Details

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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Balance Type:
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- Details

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- Details

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