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Operating Segments and Geographic Information - Summary of Reportable Segments (Details) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 03, 2021 USD ($)	Apr. 03, 2021 USD ($)	Jan. 02, 2021 USD ($)	Oct. 03, 2020 USD ($)	Jun. 27, 2020 USD ($)	Mar. 28, 2020 USD ($)	Dec. 28, 2019 USD ($)	Sep. 28, 2019 USD ($)	Jul. 03, 2021 USD ($) segment	Jun. 27, 2020 USD ($)	Jun. 29, 2019 USD ($)
Information on reportable segments
Number of broad business categories (segment) \| segment									2
Net revenue	$ 310.9	$ 303.4	$ 299.9	$ 284.7	$ 266.6	$ 256.2	$ 313.7	$ 299.8	$ 1,198.9	$ 1,136.3	$ 1,130.3
Gross profit	$ 182.9	$ 182.0	$ 180.1	$ 169.4	$ 154.6	$ 146.8	$ 189.5	$ 174.4	$ 714.4	$ 665.3	$ 651.4
Gross margin (percent)									59.60%	58.50%	57.60%
Operating income									$ 142.2	$ 118.1	$ 67.4
Operating margin (percent)									11.90%	10.40%	6.00%
Other Items
Information on reportable segments
Net revenue									$ 0.0	$ 0.0	$ 0.0
Gross profit									(37.8)	(38.9)	(38.7)
Operating income									(111.3)	(92.8)	(130.2)
Network and Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									837.9	849.4	841.2
Gross profit									$ 534.1	$ 551.2	$ 544.3
Gross margin (percent)									63.70%	64.90%	64.70%
Operating income									$ 92.2	$ 108.8	$ 99.6
Operating margin (percent)									11.00%	12.80%	11.80%
Network and Service Enablement \| Network Enablement \| Segment Measures
Information on reportable segments
Net revenue									$ 746.6	$ 746.7	$ 737.8
Gross profit									$ 474.2	$ 482.4	$ 473.3
Gross margin (percent)									63.50%	64.60%	64.20%
Network and Service Enablement \| Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									$ 91.3	$ 102.7	$ 103.4
Gross profit									$ 59.9	$ 68.8	$ 71.0
Gross margin (percent)									65.60%	67.00%	68.70%
Optical Security and Performance Products \| Segment Measures
Information on reportable segments
Net revenue									$ 361.0	$ 286.9	$ 289.1
Gross profit									$ 218.1	$ 153.0	$ 145.8
Gross margin (percent)									60.40%	53.30%	50.40%
Operating income									$ 161.3	$ 102.1	$ 98.0
Operating margin (percent)									44.70%	35.60%	33.90%
Product
Information on reportable segments
Net revenue									$ 1,051.4	$ 1,005.2	$ 1,004.2
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									691.1	719.0	715.9
Product \| Network and Service Enablement \| Network Enablement \| Segment Measures
Information on reportable segments
Net revenue									650.5	669.1	666.2
Product \| Network and Service Enablement \| Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									40.6	49.9	49.7
Product \| Optical Security and Performance Products \| Segment Measures
Information on reportable segments
Net revenue									360.3	286.2	288.3
Service
Information on reportable segments
Net revenue									147.5	131.1	126.1
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									146.8	130.4	125.3
Service \| Network and Service Enablement \| Network Enablement \| Segment Measures
Information on reportable segments
Net revenue									96.1	77.6	71.6
Service \| Network and Service Enablement \| Service Enablement \| Segment Measures
Information on reportable segments
Net revenue									50.7	52.8	53.7
Service \| Optical Security and Performance Products \| Segment Measures
Information on reportable segments
Net revenue									$ 0.7	$ 0.7	$ 0.8