Goodwill (Details) $ in Millions	9 Months Ended
	Mar. 30, 2019 USD ($)
Changes in goodwill
Balance at the beginning of the period	$ 336.3
Acquisitions	33.9
Other	3.6
Currency translation adjustments	(1.9)
Balance at the end of the period	371.9
Network Enablement
Changes in goodwill
Balance at the beginning of the period	328.0
Acquisitions	0.0
Other	3.6
Currency translation adjustments	(1.9)
Balance at the end of the period	329.7
Service Enablement
Changes in goodwill
Balance at the beginning of the period	0.0
Currency translation adjustments	0.0
Balance at the end of the period	0.0
Optical Security and Performance Products
Changes in goodwill
Balance at the beginning of the period	8.3
Acquisitions	33.9
Currency translation adjustments	0.0
Balance at the end of the period	$ 42.2