CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Apr. 02, 2016	Mar. 28, 2015	Apr. 02, 2016	Mar. 28, 2015
Income Statement [Abstract]
Net revenue		$ 230.4	$ 198.7	$ 661.3	$ 628.2
Cost of sales		165.9	139.7	458.4	428.2
Amortization of acquired technologies		1.7	1.9	5.1	5.7
Gross profit		62.8	57.1	197.8	194.3
Operating expenses:
Research and development		35.3	35.0	104.7	105.1
Selling, general and administrative		28.0	31.8	87.8	91.3
Restructuring and related charges		1.8	1.1	3.9	6.7
Total operating expenses		65.1	67.9	196.4	203.1
Income (loss) from operations		(2.3)	(10.8)	1.4	(8.8)
Unrealized loss on derivative liability		(4.8)	0.0	(5.0)	0.0
Interest and other (expense) income, net		(0.4)	(0.4)	(1.1)	(0.8)
Income (loss) before income taxes		(7.5)	(11.2)	(4.7)	(9.6)
Provision for (benefit from) income taxes		0.1	(23.4)	0.3	(22.0)
Net income (loss)		(7.6)	12.2	(5.0)	12.4
Cumulative dividends on Series A Preferred Stock		(0.3)	0.0	(0.6)	0.0
Accretion of Series A Preferred Stock		0.0	0.0	(11.7)	0.0
Net income (loss) available to common shareholders		$ (7.9)	$ 12.2	$ (17.3)	$ 12.4
Net income (loss) per share attributable to common shareholders:
Basic (usd per share)	[1]	$ (0.13)	$ 0.21	$ (0.29)	$ 0.21
Diluted (usd per share)	[1]	$ (0.13)	$ 0.21	$ (0.29)	$ 0.21
Shares used in per share calculation attributable to common shareholders:
Basic (in shares)	[1]	59.2	58.8	59.0	58.8
Diluted (in shares)	[1]	59.2	58.8	59.0	58.8

[1] On August 1, 2015, JDS Uniphase Corporation (“JDSU”) distributed 47.1 million shares, or 80.1% of the outstanding shares of common stock of Lumentum Holdings Inc. (“we”, “our”, “Company” or “Lumentum”) to existing holders of JDSU common stock. JDSU was renamed Viavi Solutions Inc. (“Viavi”) and at the time of the distribution, retained 11.7 million shares, or 19.9% of Lumentum’s outstanding shares. Basic and diluted net income (loss) per share for the three and nine months ended March 28, 2015 is calculated using the shares of Lumentum common stock outstanding on August 1, 2015, as if such shares were outstanding for the entire period.