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Goodwill (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jul. 02, 2016 USD ($)	Jul. 02, 2016 USD ($) subsegment	Jun. 27, 2015 USD ($)	Jun. 28, 2014 USD ($)	Jul. 02, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jun. 28, 2014 USD ($)
Changes in goodwill
Balance at the beginning of the period		$ 255.5	$ 261.1
Goodwill allocation - WaveReady		(6.0)
Currency translation and other adjustments		(6.0)	(5.6)
Goodwill impairment charge	$ (91.4)	(91.4)	0.0	$ 0.0
Balance at the end of the period	152.1	$ 152.1	255.5	261.1
Number of reportable segments | subsegment		2
Gross goodwill and accumulated impairment balances
Gross goodwill balance					$ 811.1	$ 823.1
Accumulated impairment losses					(659.0)	(567.6)
Net goodwill balance	152.1	$ 255.5	261.1	261.1	152.1	255.5	$ 261.1
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 rates (as a percent)		3.00%
Discount rates (as a percent)		14.00%
Terminal growth rate (as a percent)		3.00%
Maximum | Discounted Cash Flow Approach
Gross goodwill and accumulated impairment balances
Long-term annual growth rates (as a percent)		7.00%
Discount rates (as a percent)		17.00%
Terminal growth rate (as a percent)		5.00%
Network Enablement
Changes in goodwill
Balance at the beginning of the period		$ 154.5	158.0
Goodwill allocation - WaveReady		(6.0)
Currency translation and other adjustments		(4.7)	(3.5)
Goodwill impairment charge		0.0
Balance at the end of the period	143.8	143.8	154.5	158.0
Gross goodwill and accumulated impairment balances
Gross goodwill balance					445.7	456.4	459.9
Accumulated impairment losses					(301.9)	(301.9)	(301.9)
Net goodwill balance	143.8	154.5	158.0	158.0	143.8	154.5	158.0
Service Enablement
Changes in goodwill
Balance at the beginning of the period		92.7	94.8
Goodwill allocation - WaveReady		0.0
Currency translation and other adjustments		(1.3)	(2.1)
Goodwill impairment charge		(91.4)
Balance at the end of the period	0.0	0.0	92.7	94.8
Gross goodwill and accumulated impairment balances
Gross goodwill balance					272.6	273.9	276.0
Accumulated impairment losses					(272.6)	(181.2)	(181.2)
Net goodwill balance	0.0	92.7	94.8	94.8	0.0	92.7	94.8
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

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