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Discontinued Operations - Statement of Operations (Details) - Spinoff - Lumentum - USD ($) $ in Millions	12 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
Discontinued Operations
Net revenues	$ 0.0	$ 66.5
Cost of revenues	0.0	49.8
Amortization of acquired technologies	0.0	0.6
Gross profit	0.0	16.1
Operating expenses:
Research and development	0.0	12.5
Selling, general and administrative	(0.8)	24.7
Restructuring charges	0.0	0.1
Total operating expenses	(0.8)	37.3
Income (loss) from operations	0.8	(21.2)
Income (loss) before income taxes	0.8	(21.2)
(Benefit from) provision for income taxes	(0.8)	27.8
Net income (loss) from discontinued operations	$ 1.6	$ (49.0)

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