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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Quarterly consolidated statements of operations
Net revenue	$ 264.0	$ 219.4	$ 201.8	$ 195.2	$ 198.1	$ 196.0	$ 206.5	$ 210.8	$ 880.4	$ 811.4	$ 906.3
Gross profit	136.2	123.7	116.1	116.2	119.2	117.0	124.7	125.1	492.2	486.0	549.7
Net income(loss) from continuing operations, net of tax	(28.8)	(8.7)	(3.7)	(4.8)	12.1	26.0	49.2	78.0	(46.0)	165.3	(50.4)
Net income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0	1.6	0.0	0.0	0.0	0.0	1.6	(48.8)
Net (loss) income	$ (28.8)	$ (8.7)	$ (3.7)	$ (4.8)	$ 13.7	$ 26.0	$ 49.2	$ 78.0	$ (46.0)	$ 166.9	$ (99.2)
Net income (loss) per share from - basic:
Continuing operations (usd per share)	$ (0.13)	$ (0.04)	$ (0.02)	$ (0.02)	$ 0.05	$ 0.11	$ 0.21	$ 0.34	$ (0.20)	$ 0.72	$ (0.22)
Discontinued operations (usd per share)	0.00	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.01	(0.20)
Net (loss) income (usd per share)	(0.13)	(0.04)	(0.02)	(0.02)	0.06	0.11	0.21	0.34	(0.20)	0.73	(0.42)
Net income (loss) per share from - diluted:
Continuing operations (usd per share)	(0.13)	(0.04)	(0.02)	(0.02)	0.05	0.11	0.21	0.33	(0.20)	0.70	(0.22)
Discontinued operations (usd per share)	0.00	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.01	(0.20)
Net (loss) income (usd per share)	$ (0.13)	$ (0.04)	$ (0.02)	$ (0.02)	$ 0.06	$ 0.11	$ 0.21	$ 0.33	$ (0.20)	$ 0.71	$ (0.42)
Shares used in per share calculation:
Shares used in per-share calculation - basic (in shares)	226.5	226.3	227.4	228.1	227.3	229.4	230.5	232.4	227.1	229.9	234.0
Diluted net income (loss) per share from: (in shares)	226.5	226.3	227.4	228.1	232.5	234.6	234.2	236.8	227.1	234.5	234.0
Lumentum
Available-For-Sale Investments
Gross realized gains										$ 203.0

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