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Restructuring - Restructuring Plan Activity (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Mar. 29, 2025	Jun. 29, 2024	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Beginning of period balance				$ 14.9
Restructuring and related charges (benefits)	$ (0.3)		$ 0.1	0.9	$ (0.8)
Cash settlements				(11.3)
End of period balance	4.5	$ 14.9		4.5
Fiscal 2024 Plan
Restructuring and Related Charges
Expected number of positions eliminated, percentage		7.00%
Restructuring Reserve [Roll Forward]
Beginning of period balance				14.6
Restructuring and related charges (benefits)				1.1
Cash settlements				(11.2)
End of period balance	4.5	$ 14.6		4.5
Fiscal 2023 Plan
Restructuring and Related Charges
Workforce reduction percentage						5.00%
Restructuring Reserve [Roll Forward]
Beginning of period balance				0.3
Restructuring and related charges (benefits)				(0.2)
Cash settlements				(0.1)
End of period balance	0.0	0.3		0.0
Network and Service Enablement \| Fiscal 2024 Plan
Restructuring Reserve [Roll Forward]
Beginning of period balance				13.4
Restructuring and related charges (benefits)				1.2
Cash settlements				(10.2)
End of period balance	4.4	13.4		4.4
Network and Service Enablement \| Fiscal 2023 Plan
Restructuring Reserve [Roll Forward]
Beginning of period balance				0.3
Restructuring and related charges (benefits)				(0.2)
Cash settlements				(0.1)
End of period balance	0.0	0.3		0.0
Optical Security and Performance Products \| Fiscal 2024 Plan
Restructuring Reserve [Roll Forward]
Beginning of period balance				1.2
Restructuring and related charges (benefits)				(0.1)
Cash settlements				(1.0)
End of period balance	$ 0.1	$ 1.2		$ 0.1