Operating Segments and Geographic Information (Details) $ in Millions	3 Months Ended	6 Months Ended
Jan. 02, 2016 USD ($)	Dec. 27, 2014 USD ($)	Jan. 02, 2016 USD ($) segment subsegment	Dec. 27, 2014 USD ($)
Information on reportable segments
Number of broad business categories (in segment) \| segment			2
Net revenue	$ 232.1	$ 226.4	$ 461.8	$ 441.7
Gross profit	$ 141.8	$ 133.1	$ 282.3	$ 262.0
Gross margin (as a percent)	61.10%	58.80%	61.10%	59.30%
Operating income (loss)	$ 9.2	$ (21.2)	$ 6.3	$ (33.6)
Operating margin (as a percent)	4.00%	(9.40%)	1.40%	(7.60%)
Segment Measures
Information on reportable segments
Net revenue	$ 232.1	$ 226.4	$ 461.8	$ 441.7
Gross profit	$ 147.9	$ 143.7	$ 294.0	$ 282.0
Gross margin (as a percent)	63.70%	63.50%	63.70%	63.80%
Operating income (loss)	$ 30.5	$ 19.1	$ 59.2	$ 32.1
Operating margin (as a percent)	13.10%	8.40%	12.80%	7.30%
Reconciling Items
Information on reportable segments
Net revenue	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Gross profit	(6.1)	(10.6)	(11.7)	(20.0)
Operating income (loss)	(21.3)	(40.3)	$ (52.9)	(65.7)
Network and Service Enablement
Information on reportable segments
Number of subsegments (in subsegment) \| subsegment			2
Network and Service Enablement \| Segment Measures
Information on reportable segments
Net revenue	173.3	175.8	$ 338.8	347.8
Gross profit	$ 115.1	$ 117.0	$ 224.2	$ 232.2
Gross margin (as a percent)	66.40%	66.60%	66.20%	66.80%
Operating income (loss)	$ 8.0	$ 2.0	$ 10.4	$ 0.7
Operating margin (as a percent)	4.60%	1.10%	3.10%	0.20%
Network Enablement \| Segment Measures
Information on reportable segments
Net revenue	$ 136.4	$ 129.0	$ 254.0	$ 250.5
Gross profit	$ 90.6	$ 84.6	$ 166.3	$ 164.8
Gross margin (as a percent)	66.40%	65.60%	65.50%	65.80%
Service Enablement \| Segment Measures
Information on reportable segments
Net revenue	$ 36.9	$ 46.8	$ 84.8	$ 97.3
Gross profit	$ 24.5	$ 32.4	$ 57.9	$ 67.4
Gross margin (as a percent)	66.40%	69.20%	68.30%	69.30%
Optical Security and Performance Products \| Segment Measures
Information on reportable segments
Net revenue	$ 58.8	$ 50.6	$ 123.0	$ 93.9
Gross profit	$ 32.8	$ 26.7	$ 69.8	$ 49.8
Gross margin (as a percent)	55.80%	52.80%	56.70%	53.00%
Operating income (loss)	$ 22.5	$ 17.1	$ 48.8	$ 31.4
Operating margin (as a percent)	38.30%	33.80%	39.70%	33.40%

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+ 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)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Article 5

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