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Restructuring - Summary of Restructuring Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jul. 02, 2022
Summary of various restructuring plans
Restructuring and related charges (benefits)	$ 13.6	$ 12.1	$ (0.1)
Fiscal Year 2024 Restructuring Plan
Summary of various restructuring plans
Accrual balance at the beginning of the period	0.0
Restructuring and related charges (benefits)	14.8
Cash Settlements	(0.2)
Accrual balance at the end of the period	14.6	0.0
Fiscal Year 2024 Restructuring Plan \| Network and Service Enablement
Summary of various restructuring plans
Accrual balance at the beginning of the period	0.0
Restructuring and related charges (benefits)	13.6
Cash Settlements	(0.2)
Accrual balance at the end of the period	13.4	0.0
Fiscal Year 2024 Restructuring Plan \| Optical Security and Performance Products
Summary of various restructuring plans
Accrual balance at the beginning of the period	0.0
Restructuring and related charges (benefits)	1.2
Cash Settlements	0.0
Accrual balance at the end of the period	1.2	0.0
Fiscal 2023 Plan
Summary of various restructuring plans
Accrual balance at the beginning of the period	5.8
Restructuring and related charges (benefits)	13.6
Cash Settlements	(4.5)
Accrual balance at the end of the period	14.9	5.8
Fiscal 2023 Plan Phase I
Summary of various restructuring plans
Accrual balance at the beginning of the period	4.1
Restructuring and related charges (benefits)	(0.9)
Cash Settlements	(3.2)
Accrual balance at the end of the period	0.0	4.1
Fiscal 2023 Plan Phase I \| Network and Service Enablement
Summary of various restructuring plans
Accrual balance at the beginning of the period	3.5
Restructuring and related charges (benefits)	(0.9)
Cash Settlements	(2.6)
Accrual balance at the end of the period	0.0	3.5
Fiscal 2023 Plan Phase I \| Optical Security and Performance Products
Summary of various restructuring plans
Accrual balance at the beginning of the period	0.6
Restructuring and related charges (benefits)	0.0
Cash Settlements	(0.6)
Accrual balance at the end of the period	0.0	0.6
Fiscal 2023 Plan Phase II
Summary of various restructuring plans
Accrual balance at the beginning of the period	1.7
Restructuring and related charges (benefits)	(0.3)
Cash Settlements	(1.1)
Accrual balance at the end of the period	0.3	1.7
Fiscal 2023 Plan Phase II \| Network and Service Enablement
Summary of various restructuring plans
Accrual balance at the beginning of the period	1.7
Restructuring and related charges (benefits)	(0.3)
Cash Settlements	(1.1)
Accrual balance at the end of the period	$ 0.3	$ 1.7