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Goodwill (Details) $ in Millions	3 Months Ended		12 Months Ended
Goodwill (Details) $ in Millions	Jul. 02, 2016 USD ($)	Sep. 27, 2014 USD ($) subsegment	Jul. 01, 2017 USD ($) subsegment	Jul. 02, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jul. 01, 2017 USD ($)	Jul. 02, 2016 USD ($)	Jun. 27, 2015 USD ($)
Changes in goodwill
Balance at the beginning of the period			$ 152.1	$ 255.5
Goodwill allocation - WaveReady				(6.0)
Currency translation and other adjustments			(0.5)	(6.0)
Goodwill impairment charge	$ (91.4)	$ 0.0	0.0	(91.4)	$ 0.0
Balance at the end of the period	152.1		151.6	152.1	255.5
Gross goodwill and accumulated impairment balances
Gross goodwill balance						$ 810.6	$ 811.1
Accumulated impairment losses						(659.0)	(659.0)
Net goodwill balance	152.1		152.1	255.5	255.5	151.6	152.1	$ 255.5
Impairment of goodwill	91.4	$ 0.0	0.0	$ 91.4	0.0
Discounted Cash Flow Approach
Gross goodwill and accumulated impairment balances
Discount period				10 years
Minimum \| Discounted Cash Flow Approach
Gross goodwill and accumulated impairment balances
Long-term annual growth rate				3.00%
Discount rate				14.00%
Terminal growth rate				3.00%
Maximum \| Discounted Cash Flow Approach
Gross goodwill and accumulated impairment balances
Long-term annual growth rate				7.00%
Discount rate				17.00%
Terminal growth rate				5.00%
Network Enablement
Changes in goodwill
Balance at the beginning of the period			143.8	$ 154.5
Goodwill allocation - WaveReady				(6.0)
Currency translation and other adjustments			(0.5)	(4.7)
Goodwill impairment charge				0.0
Balance at the end of the period	143.8		143.3	143.8	154.5
Gross goodwill and accumulated impairment balances
Gross goodwill balance						445.2	445.7	456.4
Accumulated impairment losses						(301.9)	(301.9)	(301.9)
Net goodwill balance	143.8		143.8	154.5	154.5	143.3	143.8	154.5
Impairment of goodwill				0.0
Service Enablement
Changes in goodwill
Balance at the beginning of the period			0.0	92.7
Goodwill allocation - WaveReady				0.0
Currency translation and other adjustments			0.0	(1.3)
Goodwill impairment charge				(91.4)
Balance at the end of the period	0.0		0.0	0.0	92.7
Gross goodwill and accumulated impairment balances
Gross goodwill balance						272.6	272.6	273.9
Accumulated impairment losses						(272.6)	(272.6)	(181.2)
Net goodwill balance	0.0		0.0	92.7	92.7	0.0	0.0	92.7
Impairment of goodwill				91.4
Optical Security and Performance Products
Changes in goodwill
Balance at the beginning of the period			8.3	8.3
Goodwill allocation - WaveReady				0.0
Balance at the end of the period	8.3		8.3	8.3	8.3
Gross goodwill and accumulated impairment balances
Gross goodwill balance						92.8	92.8	92.8
Accumulated impairment losses						(84.5)	(84.5)	(84.5)
Net goodwill balance	$ 8.3		$ 8.3	$ 8.3	$ 8.3	$ 8.3	$ 8.3	$ 8.3
Network and Service Enablement
Gross goodwill and accumulated impairment balances
Number of subsegments (in subsegment) \| subsegment		2	2