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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
	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Information on reportable segments
Gross profit	$ 136.2	$ 123.7	$ 116.1	$ 116.2	$ 119.2	$ 117.0	$ 124.7	$ 125.1		$ 492.2	$ 486.0	$ 549.7
Stock-based compensation										(30.5)	(33.2)	(42.4)
Amortization of intangibles										(21.0)	(14.0)	(14.6)
Operating income										5.1	13.6	(84.3)
Impairment of goodwill									$ (91.4)	0.0	0.0	(91.4)
Restructuring and related charges										(8.3)	(21.6)	(10.5)
Loss on disposal of long-lived assets										2.1	5.7	1.5
Separation related charges											1.5	5.0
Charge related to litigation ruling												8.4
Non-recurring incremental severance and related costs upon the exit of a key executive												3.5
Segment
Information on reportable segments
Gross profit										535.9	506.3	572.2
Operating income										125.0	107.6	115.6
Non-segment
Information on reportable segments
Gross profit										(43.7)	(20.3)	(22.5)
Operating income										(119.9)	(94.0)	(199.9)
Acquisition related cost										12.7
Amortization of inventory step-up										12.4
Corporate reconciling items impacting gross profit
Information on reportable segments
Gross profit										492.2	486.0	549.7
Corporate reconciling items impacting gross profit | Segment
Information on reportable segments
Gross profit										535.9	506.3	572.2
Corporate reconciling items impacting gross profit | Non-segment
Information on reportable segments
Stock-based compensation										(3.3)	(3.6)	(4.8)
Amortization of intangibles										(26.7)	(14.3)	(17.3)
Other charges unrelated to core operating performance										(13.7)	(2.4)	(0.4)
Corporate reconciling items impacting operating income
Information on reportable segments
Operating income										5.1	13.6	(84.3)
Corporate reconciling items impacting operating income | Segment
Information on reportable segments
Operating income										125.0	107.6	115.6
Corporate reconciling items impacting operating income | Non-segment
Information on reportable segments
Stock-based compensation										(30.5)	(33.2)	(42.4)
Amortization of intangibles										(47.7)	(28.3)	(31.9)
Impairment of goodwill										0.0	0.0	(91.4)
Other charges unrelated to core operating performance										(33.4)	(10.9)	(23.7)
Restructuring and related charges										$ (8.3)	$ (21.6)	$ (10.5)

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