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Goodwill (Tables)
 12 Months Ended
Jun. 28, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Goodwill
The following table presents the changes in goodwill allocated to the Company’s reportable segments (in millions):
Network and Service
Enablement		Optical Security
and Performance
Products		Total
Balance as of July 1, 2023(1)
$413.0 $42.2 $455.2 
Currency translation (1.3)— (1.3)
Other adjustment(2)
(1.0)— (1.0)
Balance as of June 29, 2024(3)
$410.7 $42.2 $452.9 
Acquisition129.7 — 129.7 
Other adjustments(4)
0.6 — 0.6 
Currency translation 12.5 — 12.5 
Balance as of June 28, 2025(5)
$553.5 $42.2 $595.7 
(1) Gross goodwill balances for NSE and OSP were $987.5 million and $126.7 million, respectively, as of July 1, 2023. Accumulated impairment for NSE and OSP was $574.5 million and $84.5 million, respectively, as of July 1, 2023.
(2) Adjustment related to goodwill acquired as part of a prior acquisition.
(3) Gross goodwill balances for NSE and OSP were $985.2 million and $126.7 million, respectively, as of June 29, 2024. Accumulated impairment for NSE and OSP was $574.5 million and $84.5 million, respectively, as of June 29, 2024.
(4) See “Note 5. Acquisitions” of the Notes to Consolidated Financial Statement for additional information related to the Company’s acquisitions.
(5) Gross goodwill balances for NSE and OSP were $1,128.0 million and $126.7 million, respectively, as of June 28, 2025. Accumulated impairment for NSE and OSP was $574.5 million and $84.5 million, respectively, as of June 28, 2025.