Discontinued Operations - Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Discontinued Operations
Provision for income taxes		$ (4.5)
Income (loss) from discontinued operations, net of taxes	$ 0.0	$ 3.0	$ 0.0	$ (50.4)
Spinoff | Lumentum
Discontinued Operations
Net revenues				66.5
Cost of revenues				49.7
Amortization of acquired technologies				0.6
Gross profit				16.2
Research and development				12.5
Selling, general and administrative				24.0
Restructuring charges				0.1
Total operating expenses				36.6
Loss from operations				(20.4)
Interest and other income (expense), net				0.5
Loss before income taxes				(19.9)
Provision for income taxes				30.5
Net loss from discontinued operations				$ (50.4)