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Restructuring - Restructuring Plan Activity (Details) $ in Millions	3 Months Ended			6 Months Ended
	Dec. 28, 2024 USD ($) employee	Jun. 29, 2024 USD ($)	Dec. 30, 2023 USD ($)	Dec. 28, 2024 USD ($)	Dec. 30, 2023 USD ($)	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Beginning of period balance				$ 14.9
Restructuring and related charges (benefits)	$ 1.2		$ (0.1)	1.2	$ (0.9)
Cash settlements				(10.4)
End of period balance	$ 5.7	$ 14.9		5.7
Fiscal 2024 Plan
Restructuring and Related Charges
Increase in number of employees impacted \| employee	30
Expected number of positions eliminated, percentage		7.00%
Restructuring Reserve [Roll Forward]
Beginning of period balance				14.6
Restructuring and related charges (benefits)				1.4
Cash settlements				(10.3)
End of period balance	$ 5.7	$ 14.6		5.7
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)				1.5
Cash settlements				(9.4)
End of period balance	5.5	13.4		5.5
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				(0.9)
End of period balance	$ 0.2	$ 1.2		$ 0.2