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Restructuring and Related Charges - Summary of Restructuring Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 03, 2021
Summary of various restructuring plans
Restructuring and related charges (benefits)	$ 12.1	$ (0.1)	$ (1.6)
Fiscal 2023 Plan
Summary of various restructuring plans
Accrual balance at the beginning of the period	0.0
Restructuring and related charges (benefits)	12.1
Cash Settlements	(6.3)
Accrual balance at the end of the period	5.8	0.0
Fiscal 2023 Plan Phase I
Summary of various restructuring plans
Accrual balance at the beginning of the period	0.0
Restructuring and related charges (benefits)	10.4
Cash Settlements	(6.3)
Accrual balance at the end of the period	4.1	0.0
Fiscal 2023 Plan Phase I \| Network and Service Enablement
Summary of various restructuring plans
Accrual balance at the beginning of the period	0.0
Restructuring and related charges (benefits)	9.1
Cash Settlements	(5.6)
Accrual balance at the end of the period	3.5	0.0
Fiscal 2023 Plan Phase I \| 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)	1.3
Cash Settlements	(0.7)
Accrual balance at the end of the period	0.6	0.0
Fiscal 2023 Plan Phase II
Summary of various restructuring plans
Accrual balance at the beginning of the period	0.0
Restructuring and related charges (benefits)	1.7
Cash Settlements	0.0
Accrual balance at the end of the period	1.7	0.0
Fiscal 2023 Plan Phase II \| Network and Service Enablement
Summary of various restructuring plans
Accrual balance at the beginning of the period	0.0
Restructuring and related charges (benefits)	1.7
Cash Settlements	0.0
Accrual balance at the end of the period	$ 1.7	$ 0.0