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Balance Sheet and Other Details - Accounts Receivable Reserves and Allowances (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 29, 2019 | Jun. 30, 2018 | Jul. 01, 2017
Allowance for Doubtful Accounts Receivable |  |  |
Balance at Beginning of Period | $ 2.4 | $ 1.6 | $ 2.2
Acquisitions | 0.0 | 0.7 | 0.0
Charged to Costs and Expenses | 1.4 | (0.4) | (0.2)
Deduction | (1.8) | 0.5 | (0.4)
Balance at End of Period | $ 2.0 | $ 2.4 | $ 1.6

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Allowance For Doubtful Accounts Receivable, Acquisitions + References No definition available. + Details
Name: | viav_AllowanceForDoubtfulAccountsReceivableAcquisitions
Namespace Prefix: | viav_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Allowance For Doubtful Accounts Receivable, Currency Translation Adjustments And Write-Offs Against Allowance + References No definition available. + Details
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Namespace Prefix: | viav_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration