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Operating Segments and Geographic Information - Summary of Reportable Segments (Details) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 02, 2022 USD ($)	Apr. 02, 2022 USD ($)	Jan. 01, 2022 USD ($)	Oct. 02, 2021 USD ($)	Jul. 03, 2021 USD ($)	Apr. 03, 2021 USD ($)	Jan. 02, 2021 USD ($)	Oct. 03, 2020 USD ($)	Jul. 02, 2022 USD ($) segment	Jul. 03, 2021 USD ($)	Jun. 27, 2020 USD ($)
Information on reportable segments
Number of broad business categories (segment) \| segment									2
Net revenue	$ 335.3	$ 315.5	$ 314.8	$ 326.8	$ 310.9	$ 303.4	$ 299.9	$ 284.7	$ 1,292.4	$ 1,198.9	$ 1,136.3
Gross profit	$ 201.1	$ 186.9	$ 190.5	$ 195.0	$ 182.9	$ 182.0	$ 180.1	$ 169.4	$ 773.5	$ 714.4	$ 665.3
Gross margin (percent)									59.80%	59.60%	58.50%
Operating income									$ 185.0	$ 142.2	$ 118.1
Operating margin (percent)									14.30%	11.90%	10.40%
Other Items
Information on reportable segments
Net revenue									$ 0.0	$ 0.0	$ 0.0
Gross profit									(35.2)	(37.8)	(38.9)
Operating income									(101.8)	(111.3)	(92.8)
Network and Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									949.1	837.9	849.4
Gross profit									$ 615.1	$ 534.1	$ 551.2
Gross margin (percent)									64.80%	63.70%	64.90%
Operating income									$ 147.8	$ 92.2	$ 108.8
Operating margin (percent)									15.60%	11.00%	12.80%
Network and Service Enablement \| Network Enablement \| Segment Measures
Information on reportable segments
Net revenue									$ 845.8	$ 746.6	$ 746.7
Gross profit									$ 543.6	$ 474.2	$ 482.4
Gross margin (percent)									64.30%	63.50%	64.60%
Network and Service Enablement \| Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									$ 103.3	$ 91.3	$ 102.7
Gross profit									$ 71.5	$ 59.9	$ 68.8
Gross margin (percent)									69.20%	65.60%	67.00%
Optical Security and Performance Products \| Segment Measures
Information on reportable segments
Net revenue									$ 343.3	$ 361.0	$ 286.9
Gross profit									$ 193.6	$ 218.1	$ 153.0
Gross margin (percent)									56.40%	60.40%	53.30%
Operating income									$ 139.0	$ 161.3	$ 102.1
Operating margin (percent)									40.50%	44.70%	35.60%
Product
Information on reportable segments
Net revenue									$ 1,135.5	$ 1,051.4	$ 1,005.2
Product \| Other Items
Information on reportable segments
Net revenue									0.0	0.0	0.0
Product \| Network and Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									792.7	691.1	719.0
Product \| Network and Service Enablement \| Network Enablement \| Segment Measures
Information on reportable segments
Net revenue									739.7	650.5	669.1
Product \| Network and Service Enablement \| Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									53.0	40.6	49.9
Product \| Optical Security and Performance Products \| Segment Measures
Information on reportable segments
Net revenue									342.8	360.3	286.2
Service
Information on reportable segments
Net revenue									156.9	147.5	131.1
Service \| Other Items
Information on reportable segments
Net revenue									0.0	0.0	0.0
Service \| Network and Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									156.4	146.8	130.4
Service \| Network and Service Enablement \| Network Enablement \| Segment Measures
Information on reportable segments
Net revenue									106.1	96.1	77.6
Service \| Network and Service Enablement \| Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									50.3	50.7	52.8
Service \| Optical Security and Performance Products \| Segment Measures
Information on reportable segments
Net revenue									$ 0.5	$ 0.7	$ 0.7