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Discontinued Operations - Supplemental Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Operating activities:
Depreciation expense	$ 35.7	$ 29.4	$ 38.1
Amortization expense	21.0	14.0	14.6
Stock-based compensation expense	$ 30.5	$ 33.2	42.4
Spinoff | Discontinued Operations | Lumentum
Operating activities:
Depreciation expense			3.7
Amortization expense			0.6
Stock-based compensation expense			1.6
Investing activities:
Capital expenditures			$ 5.8

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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