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Operating Segments and Geographic Information - Summary of Reportable Segments (Details) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jul. 01, 2017 USD ($)	Apr. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 01, 2016 USD ($)	Jun. 30, 2018 USD ($) segment	Jul. 01, 2017 USD ($)	Jul. 02, 2016 USD ($)
Information on reportable segments
Number of broad business categories (segment) | segment									2
Net revenue	$ 264.0	$ 219.4	$ 201.8	$ 195.2	$ 198.1	$ 196.0	$ 206.5	$ 210.8	$ 880.4	$ 811.4	$ 906.3
Gross profit	$ 136.2	$ 123.7	$ 116.1	$ 116.2	$ 119.2	$ 117.0	$ 124.7	$ 125.1	$ 492.2	$ 486.0	$ 549.7
Gross margin (percent)									55.90%	59.90%	60.70%
Operating income									$ 5.1	$ 13.6	$ (84.3)
Operating margin (percent)									0.60%	1.70%	(9.30%)
Segment Measures
Information on reportable segments
Net revenue									$ 880.4	$ 811.4	$ 906.3
Gross profit									$ 535.9	$ 506.3	$ 572.2
Gross margin (percent)									60.90%	62.40%	63.10%
Operating income									$ 125.0	$ 107.6	$ 115.6
Operating margin (percent)									14.20%	13.30%	12.80%
Other Items
Information on reportable segments
Net revenue									$ 0.0	$ 0.0	$ 0.0
Gross profit									(43.7)	(20.3)	(22.5)
Operating income									(119.9)	(94.0)	(199.9)
Network and Service Enablement | Segment Measures
Information on reportable segments
Net revenue									662.3	579.2	658.2
Gross profit									$ 420.7	$ 372.5	$ 429.1
Gross margin (percent)									63.50%	64.30%	65.20%
Operating income									$ 46.8	$ 7.3	$ 12.7
Operating margin (percent)									7.10%	1.30%	1.90%
Network and Service Enablement | Network Enablement | Segment Measures
Information on reportable segments
Net revenue									$ 538.5	$ 444.0	$ 504.6
Gross profit									$ 333.6	$ 286.3	$ 329.7
Gross margin (percent)									61.90%	64.50%	65.30%
Network and Service Enablement | Service Enablement | Segment Measures
Information on reportable segments
Net revenue									$ 123.8	$ 135.2	$ 153.6
Gross profit									$ 87.1	$ 86.2	$ 99.4
Gross margin (percent)									70.40%	63.80%	64.70%
Optical Security and Performance Products | Segment Measures
Information on reportable segments
Net revenue									$ 218.1	$ 232.2	$ 248.1
Gross profit									$ 115.2	$ 133.8	$ 143.1
Gross margin (percent)									52.80%	57.60%	57.70%
Operating income									$ 78.2	$ 100.3	$ 102.9
Operating margin (percent)									35.90%	43.20%	41.50%

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