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Operating Segments and Geographic Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 02, 2016 USD ($)	Apr. 02, 2016 USD ($)	Jan. 02, 2016 USD ($)	Oct. 03, 2015 USD ($)	Jun. 27, 2015 USD ($)	Mar. 28, 2015 USD ($)	Dec. 27, 2014 USD ($)	Sep. 27, 2014 USD ($)	Jul. 02, 2016 USD ($) segment subsegment	Jun. 27, 2015 USD ($)	Jun. 28, 2014 USD ($)
Information on reportable segments
Number of broad business categories (in segment) | segment									2
Number of subsegments (in subsegment) | subsegment									2
Net revenue	$ 224.1	$ 220.4	$ 232.1	$ 229.7	$ 219.8	$ 212.4	$ 226.4	$ 215.3	$ 906.3	$ 873.9	$ 926.9
Gross profit	$ 136.1	$ 131.3	$ 141.8	$ 140.5	$ 131.1	$ 127.0	$ 133.1	$ 128.9	$ 549.7	$ 520.1	$ 527.8
Gross margin (as a percent)									60.70%	59.50%	56.90%
Income (loss) from operations									$ (84.3)	$ (75.8)	$ (55.6)
Operating margin (as a percent)									(9.30%)	(8.70%)	(6.00%)
Segment Measures
Information on reportable segments
Net revenue									$ 906.3	$ 873.9	$ 926.9
Gross profit									$ 572.2	$ 557.4	$ 567.1
Gross margin (as a percent)									63.10%	63.80%	61.20%
Income (loss) from operations									$ 115.6	$ 68.0	$ 63.6
Operating margin (as a percent)									12.80%	7.80%	6.90%
Reconciling Items
Information on reportable segments
Net revenue									$ 0.0	$ 0.0	$ 0.0
Gross profit									(22.5)	(37.3)	(39.3)
Income (loss) from operations									(199.9)	(143.8)	(119.2)
Network and Service Enablement | Segment Measures
Information on reportable segments
Net revenue									658.2	681.1	726.1
Gross profit									$ 429.1	$ 453.1	$ 466.4
Gross margin (as a percent)									65.20%	66.50%	64.20%
Income (loss) from operations									$ 12.7	$ (0.1)	$ (0.2)
Operating margin (as a percent)									1.90%	0.00%	0.00%
Network Enablement | Segment Measures
Information on reportable segments
Net revenue									$ 504.6	$ 506.8	$ 570.1
Gross profit									$ 329.7	$ 333.9	$ 371.0
Gross margin (as a percent)									65.30%	65.90%	65.10%
Service Enablement | Segment Measures
Information on reportable segments
Net revenue									$ 153.6	$ 174.3	$ 156.0
Gross profit									$ 99.4	$ 119.2	$ 95.4
Gross margin (as a percent)									64.70%	68.40%	61.20%
Optical Security and Performance Products | Segment Measures
Information on reportable segments
Net revenue									$ 248.1	$ 192.8	$ 200.8
Gross profit									$ 143.1	$ 104.3	$ 100.7
Gross margin (as a percent)									57.70%	54.10%	50.10%
Income (loss) from operations									$ 102.9	$ 68.1	$ 63.8
Operating margin (as a percent)									41.50%	35.30%	31.80%

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
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