Acquired Developed Technology and Other Intangibles - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 29, 2019	Jun. 30, 2018	Jul. 01, 2017
Acquired Developed Technology and Other Intangibles
Amortization expense related to acquired developed technology and other intangibles	$ 72.5	$ 47.7	$ 28.3

Aggregate amount of intangible amortization of assets recognized as expense during the period.

No definition available.

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