Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Dec. 27, 2025	Jun. 28, 2025
Loss Contingencies
Legally-binding purchase commitment obligations	$ 1,086.0
Typical duration of supply agreements with single or limited source vendors (in years)	1 year
Noncurrent portion of benefit obligation		$ 21.4
Minimum
Loss Contingencies
Product warranty term (in months/years)	6 months
Maximum
Loss Contingencies
Product warranty term (in months/years)	5 years

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.

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+ Details

Lumentum Holdings Inc. 10-Q