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Operating Segments and Geographic Information - Summary of Reportable Segments (Details) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 29, 2018 USD ($)	Sep. 29, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 29, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Jul. 01, 2017 USD ($)
Information on reportable segments
Number of broad business categories (segment) | segment									2
Net revenue	$ 289.7	$ 265.2	$ 306.9	$ 268.5	$ 260.7	$ 218.7	$ 205.4	$ 190.9	$ 1,130.3	$ 875.7	$ 805.0
Gross profit	$ 169.5	$ 153.5	$ 178.0	$ 150.4	$ 133.0	$ 123.3	$ 119.4	$ 112.7	$ 651.4	$ 488.4	$ 479.0
Gross margin (percent)									57.60%	55.80%	59.50%
Operating income									$ 67.4	$ 1.9	$ 7.0
Operating margin (percent)									6.00%	0.20%	0.90%
Other Items
Information on reportable segments
Net revenue									$ 0.0	$ 0.0	$ 0.0
Gross profit									(38.7)	(43.7)	(20.3)
Operating income									(130.2)	(119.9)	(94.0)
Network and Service Enablement | Segment Measures
Information on reportable segments
Net revenue									841.2	657.6	572.8
Gross profit									$ 544.3	$ 416.9	$ 365.5
Gross margin (percent)									64.70%	63.40%	63.80%
Operating income									$ 99.6	$ 43.6	$ 0.5
Operating margin (percent)									11.80%	6.60%	0.10%
Network and Service Enablement | Network Enablement | Segment Measures
Information on reportable segments
Net revenue									$ 737.8	$ 539.1	$ 445.1
Gross profit									$ 473.3	$ 334.3	$ 287.5
Gross margin (percent)									64.20%	62.00%	64.60%
Network and Service Enablement | Service Enablement | Segment Measures
Information on reportable segments
Net revenue									$ 103.4	$ 118.5	$ 127.7
Gross profit									$ 71.0	$ 82.6	$ 78.0
Gross margin (percent)									68.70%	69.70%	61.10%
Optical Security and Performance Products | Segment Measures
Information on reportable segments
Net revenue									$ 289.1	$ 218.1	$ 232.2
Gross profit									$ 145.8	$ 115.2	$ 133.8
Gross margin (percent)									50.40%	52.80%	57.60%
Operating income									$ 98.0	$ 78.2	$ 100.5
Operating margin (percent)									33.90%	35.90%	43.30%
Product
Information on reportable segments
Net revenue									$ 1,004.2	$ 772.5	$ 706.0
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									715.9	556.4	475.2
Product | Network and Service Enablement | Network Enablement | Segment Measures
Information on reportable segments
Net revenue									666.2	497.1	410.6
Product | Network and Service Enablement | Service Enablement | Segment Measures
Information on reportable segments
Net revenue									49.7	59.3	64.6
Product | Optical Security and Performance Products | Segment Measures
Information on reportable segments
Net revenue									288.3	216.0	230.8
Service
Information on reportable segments
Net revenue									126.1	103.2	99.0
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									125.3	101.2	97.6
Service | Network and Service Enablement | Network Enablement | Segment Measures
Information on reportable segments
Net revenue									71.6	42.0	34.5
Service | Network and Service Enablement | Service Enablement | Segment Measures
Information on reportable segments
Net revenue									53.7	59.2	63.1
Service | Optical Security and Performance Products | Segment Measures
Information on reportable segments
Net revenue									$ 0.8	$ 2.1	$ 1.4

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