Operating Segments and Geographic Information - Schedule of Information on Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 02, 2022	Apr. 03, 2021	Apr. 02, 2022	Apr. 03, 2021	Jul. 03, 2021
Information on reportable segments
Net revenue	$ 395.4	$ 419.5	$ 1,290.5	$ 1,350.7
Gross profit:	167.2	185.0	606.9	620.3
Stock-based compensation	(23.3)	(25.1)	(75.4)	(68.7)
Amortization of acquired intangibles	(21.4)	(22.0)	(64.3)	(63.6)
Operating segments
Information on reportable segments
Net revenue	395.4	419.5	1,290.5	1,350.7
Gross profit:	195.6	209.2	670.3	700.3
Operating segments | OpComms
Information on reportable segments
Net revenue	344.2	387.9	1,147.6	1,265.5
Gross profit:	168.5	194.3	596.2	660.9
Operating segments | Lasers
Information on reportable segments
Net revenue	51.2	31.6	142.9	85.2
Gross profit:	27.1	14.9	74.1	39.4
Unallocated corporate items:
Information on reportable segments
Stock-based compensation	(5.4)	(5.3)	(15.2)	(13.8)
Amortization of acquired intangibles	(15.6)	(15.8)	(47.3)	(45.8)
Inventory and fixed asset write down due to product line exits	0.0	0.0	(0.1)	(0.4)
Other (charges) gains	$ (7.4)	$ (3.1)	$ (0.8)	$ (20.0)	$ (5.9)