COMBINED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 27, 2015		Jun. 28, 2014		Jun. 29, 2013
Income Statement [Abstract]
Net revenue	$ 208.9	$ 198.7	$ 210.5	$ 219.0	$ 201.0	$ 201.6	$ 203.6	$ 211.7	$ 837.1		$ 817.9		$ 769.9
Cost of sales	143.4	139.7	141.7	146.8	135.0	135.4	138.3	143.6	571.6		552.3		534.9
Amortization of acquired technologies	1.9	1.9	1.9	1.9	2.2	2.2	2.3	2.3	7.6		9.0		12.2
Gross profit	63.6	57.1	66.9	70.3	63.8	64.0	63.0	65.8	257.9		256.6		222.8
Operating expenses:
Research and development	35.7	35.0	35.1	35.0	36.6	33.8	33.0	31.5	140.8		134.9		113.7
Selling, general and administrative	37.6	31.8	31.2	28.3	30.3	26.5	26.0	25.4	128.9		108.2		102.6
Restructuring and related charges	4.9	1.1	3.8	1.8	3.7	0.0	1.2	(0.1)	11.6		4.8		2.6
Total operating expenses	78.2	67.9	70.1	65.1	70.6	60.3	60.2	56.8	281.3		247.9		218.9
(Loss) income from operations	(14.6)	(10.8)	(3.2)	5.2	(6.8)	3.7	2.8	9.0	(23.4)		8.7		3.9
Interest and other income (expense), net	(0.3)	(0.1)	0.1	(0.1)	(0.1)	1.1	0.3	0.0	(0.4)		1.3		0.8
Interest expense	0.0	(0.3)	(0.2)	(0.2)	(0.1)	0.3	(0.2)	(0.2)	(0.7)		(0.2)		(1.0)
(Loss) income before income taxes	(14.9)	(11.2)	(3.3)	4.9	(7.0)	5.1	2.9	8.8	(24.5)		9.8		3.7
Benefit from income taxes	0.9	(23.4)	0.8	0.6	(0.3)	0.3	(1.0)	0.1	(21.1)		(0.9)		(2.8)
Net (loss) income	$ (15.8)	$ 12.2	$ (4.1)	$ 4.3	$ (6.7)	$ 4.8	$ 3.9	$ 8.7	$ (3.4)		$ 10.7		$ 6.5
Net (loss) income per share - basic and diluted (usd per share)	$ (0.27)	$ 0.21	$ (0.07)	$ 0.07	$ (0.11)	$ 0.08	$ 0.06	$ 0.15	$ (0.06)	[1]	$ 0.18	[1]	$ 0.11	[1]
Basic and diluted average shares outstanding (in shares)	58.8	58.8	58.8	58.8	58.8	58.8	58.8	58.8	58.8	[1]	58.8	[1]	58.8	[1]

[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. (“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 (loss) income per share for all periods through June 27, 2015 is calculated using the shares of Lumentum common stock outstanding on August 1, 2015. Refer to "Note 4. Earnings Per Share" to the audited annual combined financial statements for more detail.