CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jun. 27, 2015
Income Statement [Abstract]
Net revenue	$ 1,001.6	$ 903.0	$ 837.1
Cost of sales	677.0	618.9	571.6
Amortization of acquired technologies	6.5	6.8	7.6
Gross profit	318.1	277.3	257.9
Operating expenses:
Research and development	148.3	141.1	140.8
Selling, general and administrative	110.2	117.3	128.9
Restructuring and related charges	12.0	7.4	11.6
Total operating expenses	270.5	265.8	281.3
Income (loss) from operations	47.6	11.5	(23.4)
Unrealized loss on derivative liabilities	(104.2)	(0.6)	0.0
Interest and other income (expense), net	(3.2)	(1.2)	(1.1)
Income (loss) before income taxes	(59.8)	9.7	(24.5)
Provision for (benefit from) income tax	42.7	0.4	(21.1)
Net income (loss)	(102.5)	9.3	(3.4)
Cumulative dividends on Series A Preferred Stock	(0.9)	(0.8)	0.0
Accretion of Series A Preferred Stock	0.0	(11.7)	0.0
Net income (loss) attributable to common stockholders	$ (103.4)	$ (3.2)	$ (3.4)
Net income (loss) per share attributable to common stockholders
Basic (usd per share)	$ (1.71)	$ (0.05)	$ (0.06)	[1]
Diluted (usd per share)	$ (1.71)	$ (0.05)	$ (0.06)	[1]
Shares used in per share calculation attributable to common stockholders
Basic (in shares)	60.6	59.1	58.8	[1]
Diluted (in shares)	60.6	59.1	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 income (loss) 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” in the Notes to Consolidated Financial Statements.