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Operating Segments and Geographic Information - Reconciliation to Gross Profit and Operating Income (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Sep. 27, 2014	Jul. 01, 2017	Jul. 02, 2016	Jun. 27, 2015
Information on reportable segments
Amortization of intangibles										$ (14.3)	$ (17.3)	$ (31.9)
Gross profit	$ 119.2	$ 117.0	$ 124.7	$ 125.1	$ 136.1	$ 131.3	$ 141.8	$ 140.5		486.0	549.7	520.1
Stock-based compensation										(33.2)	(42.4)	(47.5)
Amortization of intangibles										(14.0)	(14.6)	(19.5)
Impairment of goodwill					$ (91.4)				$ 0.0	0.0	(91.4)	0.0
Restructuring and related charges										(21.6)	(10.5)	(26.8)
Income (loss) from operations										13.6	(84.3)	(75.8)
Loss on disposal of long-lived assets										5.7	1.5	1.1
Separation related charges										1.5	5.0	9.8
Non-recurring charges related to litigation											8.4
Severance and related costs											3.5
In-process research and development | Trendium Inc. (Trendium)
Information on reportable segments
Impairment charge												3.6
Segment Measures
Information on reportable segments
Gross profit										506.3	572.2	557.4
Income (loss) from operations										107.6	115.6	68.0
Reconciling Items
Information on reportable segments
Stock-based compensation										(3.6)	(4.8)	(4.2)
Amortization of intangibles										(14.3)	(17.3)	(31.9)
Other charges unrelated to core operating performance										(2.4)	(0.4)	(1.2)
Gross profit										(20.3)	(22.5)	(37.3)
Stock-based compensation										(33.2)	(42.4)	(47.5)
Amortization of intangibles										(28.3)	(31.9)	(51.4)
Impairment of goodwill										0.0	(91.4)	0.0
Other charges unrelated to core operating performance										(10.9)	(23.7)	(18.1)
Restructuring and related charges										(21.6)	(10.5)	(26.8)
Income (loss) from operations										$ (94.0)	$ (199.9)	$ (143.8)

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