Goodwill - Changes in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 03, 2021
Changes in goodwill
Balance at the beginning of the period	$ 387.6	$ 396.5
Acquisitions	60.0	10.0
Currency translation and other adjustments		(18.9)
Measurement period adjustment	(0.5)
Currency translation adjustments	8.1
Balance at the end of the period	455.2	387.6
Network Enablement
Changes in goodwill
Balance at the beginning of the period	331.6	349.7
Acquisitions	60.0	0.0
Currency translation and other adjustments		(18.1)
Measurement period adjustment	(0.5)
Currency translation adjustments	6.9
Balance at the end of the period	398.0	331.6
Goodwill balance	699.9	633.5	$ 651.6
Accumulated impairment losses	301.9	301.9	301.9
Service Enablement
Changes in goodwill
Balance at the beginning of the period	13.8	4.6
Acquisitions	0.0	10.0
Currency translation and other adjustments		(0.8)
Measurement period adjustment	0.0
Currency translation adjustments	1.2
Balance at the end of the period	15.0	13.8
Goodwill balance	287.6	286.4	277.2
Accumulated impairment losses	272.6	272.6	272.6
Optical Security and Performance Products
Changes in goodwill
Balance at the beginning of the period	42.2	42.2
Acquisitions	0.0	0.0
Currency translation and other adjustments		0.0
Measurement period adjustment	0.0
Currency translation adjustments	0.0
Balance at the end of the period	42.2	42.2
Goodwill balance	126.7	126.7	126.7
Accumulated impairment losses	$ 84.5	$ 84.5	$ 84.5