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Description of Business and Summary of Significant Accounting Policies (Details) $ in Millions		12 Months Ended
	Aug. 01, 2015	Jul. 02, 2016 USD ($) customer	Jun. 27, 2015 USD ($) customer	Jun. 28, 2014 USD ($)
Property, Plant and Equipment
Percentage of outstanding shares distributed	80.10%
Stock conversion ratio in distribution	0.2
Restricted Cash
Restricted cash		$ 12.2	$ 26.2
Long-term restricted cash balances		$ 6.0	6.1
Investments
Generally the maximum term of maturities classified as current assets included in short-term investments		12 months
Goodwill
Minimum percentage of likelihood that event occurrence is considered more likely than not		50.00%
Pension and Other Postretirement Benefits
Classification as current, period of time for payment of benefits		12 months
Concentration of Credit and Other Risks and Allowance for Doubtful Accounts
Rolling period for determination of material requirements		12 months
Advertising Expense
Advertising cost during the period		$ 2.6	1.7	$ 2.2
Asset Retirement Obligations
Asset retirement obligations included in other current liabilities		0.2	1.7
Asset retirement obligations included in other non-current liabilities		3.5	2.7
Changes in asset retirement obligations:
Balance at Beginning of Period		4.4	4.9
Liabilities Incurred		0.4	0.1
Liabilities Settled		(0.9)	(0.6)
Accretion Expense		0.2	0.3
Revisions to Estimates		(0.4)	(0.3)
Balance at End of Period		$ 3.7	$ 4.4	$ 4.9
Customer Concentration Risk | Accounts receivable, net
Concentration of Credit and Other Risks
Number of significant customers (in customer) | customer		1	0
Lumentum
Property, Plant and Equipment
Ownership percentage	19.90%
Demonstration units
Investments
Estimated useful lives		5 years
Minimum | Building and improvements
Investments
Estimated useful lives		10 years
Minimum | Machinery and equipment
Investments
Estimated useful lives		2 years
Minimum | Furniture and fixtures
Investments
Estimated useful lives		2 years
Minimum | Software
Investments
Estimated useful lives		2 years
Minimum | Office equipment
Investments
Estimated useful lives		2 years
Maximum | Building and improvements
Investments
Estimated useful lives		50 years
Maximum | Machinery and equipment
Investments
Estimated useful lives		20 years
Maximum | Furniture and fixtures
Investments
Estimated useful lives		5 years
Maximum | Software
Investments
Estimated useful lives		5 years
Maximum | Office equipment
Investments
Estimated useful lives		5 years
Senior 0.625 Percent Convertible Debentures Due 2033
Investments
Interest rate on senior convertible notes (as a percent)		0.625%	0.625%

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