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Commitments and Contingencies - Financing Obligations - Santa Rosa (Details) $ in Millions		1 Months Ended
	Aug. 21, 2007 USD ($) renewal_option	May 31, 2019 amendment	Aug. 31, 2012 amendment	Jul. 03, 2021 USD ($)	Jun. 27, 2020 USD ($)
Santa Rosa
Financing Obligations
Net cash proceeds received from sale and lease back transaction	$ 32.2
Number of renewal options (in renewal option) | renewal_option	2
Renewal term	5 years
Financing obligation, current				$ 0.1	$ 0.1
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]				Other current liabilities	Other current liabilities
Financing obligation, noncurrent				$ 16.1	$ 16.2
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]				Other non-current liabilities	Other non-current liabilities
Santa Rosa | Minimum
Financing Obligations
Lease term	1 year
Santa Rosa | Maximum
Financing Obligations
Lease term	10 years
Santa Rosa Sale Leaseback Amendment
Financing Obligations
Renewal term		10 years
Lease amendments | amendment		2	2

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

X

- Definition

Indicates line item in statement of financial position that includes current finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918631-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Indicates line item in statement of financial position that includes noncurrent finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918631-209977

+ Details

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Period Type:	instant

X

- 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

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

X

- Definition

Number Of Lease Amendments

+ References

No definition available.

+ Details

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

X

- Definition

Sale Leaseback Transaction, Lease Term

+ References

No definition available.

+ Details

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

X

- Definition

Sale Leaseback Transaction, Net Proceeds, Financing Obligations

+ References

No definition available.

+ Details

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

X

- Definition

Sale Leaseback Transaction, Number Of Renewal Options

+ References

No definition available.

+ Details

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Namespace Prefix:	viav_
Data Type:	xbrli:integerItemType
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X

- Definition

Sale Leaseback Transaction, Renewal Term

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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- Details

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