Operating Segments and Geographic Information - Summary of Reportable Segments (Details) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 01, 2023 USD ($)	Apr. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 01, 2022 USD ($)	Jul. 02, 2022 USD ($)	Apr. 02, 2022 USD ($)	Jan. 01, 2022 USD ($)	Oct. 02, 2021 USD ($)	Jul. 01, 2023 USD ($) segment	Jul. 02, 2022 USD ($)	Jul. 03, 2021 USD ($)
Information on reportable segments
Number of broad business categories (segment) | segment									2
Net revenue	$ 263.6	$ 247.8	$ 284.5	$ 310.2	$ 335.3	$ 315.5	$ 314.8	$ 326.8	$ 1,106.1	$ 1,292.4	$ 1,198.9
Gross profit	$ 146.0	$ 141.0	$ 167.0	$ 184.8	$ 201.1	$ 186.9	$ 190.5	$ 195.0	$ 638.8	$ 773.5	$ 714.4
Gross margin (percent)									57.80%	59.80%	59.60%
Operating income									$ 82.4	$ 185.0	$ 142.2
Operating margin (percent)									7.40%	14.30%	11.90%
Other Items
Information on reportable segments
Net revenue									$ 0.0	$ 0.0	$ 0.0
Gross profit									(30.0)	(35.2)	(37.8)
Operating income									(90.1)	(101.8)	(111.3)
Network and Service Enablement | Segment Measures
Information on reportable segments
Net revenue									801.2	949.1	837.9
Gross profit									$ 510.2	$ 615.1	$ 534.1
Gross margin (percent)									63.70%	64.80%	63.70%
Operating income									$ 61.2	$ 147.8	$ 92.2
Operating margin (percent)									7.60%	15.60%	11.00%
Network and Service Enablement | Network Enablement | Segment Measures
Information on reportable segments
Net revenue									$ 697.5	$ 845.8	$ 746.6
Gross profit									$ 440.1	$ 543.6	$ 474.2
Gross margin (percent)									63.10%	64.30%	63.50%
Network and Service Enablement | Service Enablement | Segment Measures
Information on reportable segments
Net revenue									$ 103.7	$ 103.3	$ 91.3
Gross profit									$ 70.1	$ 71.5	$ 59.9
Gross margin (percent)									67.60%	69.20%	65.60%
Optical Security and Performance Products | Segment Measures
Information on reportable segments
Net revenue									$ 304.9	$ 343.3	$ 361.0
Gross profit									$ 158.6	$ 193.6	$ 218.1
Gross margin (percent)									52.00%	56.40%	60.40%
Operating income									$ 111.3	$ 139.0	$ 161.3
Operating margin (percent)									36.50%	40.50%	44.70%
Product
Information on reportable segments
Net revenue									$ 936.1	$ 1,135.5	$ 1,051.4
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									631.3	792.7	691.1
Product | Network and Service Enablement | Network Enablement | Segment Measures
Information on reportable segments
Net revenue									583.9	739.7	650.5
Product | Network and Service Enablement | Service Enablement | Segment Measures
Information on reportable segments
Net revenue									47.4	53.0	40.6
Product | Optical Security and Performance Products | Segment Measures
Information on reportable segments
Net revenue									304.8	342.8	360.3
Service
Information on reportable segments
Net revenue									170.0	156.9	147.5
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									169.9	156.4	146.8
Service | Network and Service Enablement | Network Enablement | Segment Measures
Information on reportable segments
Net revenue									113.6	106.1	96.1
Service | Network and Service Enablement | Service Enablement | Segment Measures
Information on reportable segments
Net revenue									56.3	50.3	50.7
Service | Optical Security and Performance Products | Segment Measures
Information on reportable segments
Net revenue									$ 0.1	$ 0.5	$ 0.7