Description of Business and Summary of Significant Accounting Policies (Details) $ in Millions			3 Months Ended			12 Months Ended
	Aug. 01, 2015	Jun. 29, 2013 USD ($)	Sep. 27, 2014 USD ($) item	Dec. 28, 2013 USD ($)	Dec. 29, 2012 USD ($)	Jun. 27, 2015 USD ($) customer	Jun. 28, 2014 USD ($) customer	Jun. 29, 2013 USD ($) customer	Sep. 10, 2014 item	Aug. 21, 2013
Fiscal 2013 Out-of-Period Adjustments
Impact of out-of-period adjustments to net income in the period recorded		$ 2.5
Restricted Cash
Restricted cash						$ 26.2	$ 31.9
Long-term restricted cash balances						$ 6.1	$ 6.6
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%
Fiscal years, change in reportable segments and spinoff plans announcement
Number of weeks in fiscal year						364 days	364 days	364 days
New reportable segments | item			2
Number of new public entities | item									2
Long-lived assets held for sale
Classification as assets held for sale, period of time for expected sale						1 year
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
Number of major customers based on accounts receivable and net revenue | customer						1	1	1
Rolling period for determination of material requirements						12 months
Advertising Expense
Advertising cost during the period						$ 1.7	$ 2.2	$ 0.8
Asset Retirement Obligations ("ARO")
Asset retirement obligations included in other current liabilities						2.0	2.0
Asset retirement obligations						4.5	5.1
Changes in asset retirement obligations:
Balance at Beginning of Period			$ 7.1			7.1	9.2
Liabilities Incurred						0.1	0.4
Liabilities Settled						(0.7)	(1.0)
Accretion Expense						0.3	0.4
Revisions to Estimates						(0.3)	(1.9)
Balance at End of Period		$ 9.2				$ 6.5	$ 7.1	$ 9.2
Hologram Business
Proceeds from sale of business
Gross proceeds from sale of business				$ 11.5	$ 11.5
0.625% Senior Convertible Debentures due 2033 ("notes")
Proceeds from sale of business
Interest rate on senior convertible notes (as a percent)						0.625%	0.625%			0.625%
Minimum
Fiscal years, change in reportable segments and spinoff plans announcement
Number of weeks in fiscal year						364 days
Maximum
Fiscal years, change in reportable segments and spinoff plans announcement
Number of weeks in fiscal year						371 days
Building and improvements | Minimum
Estimated useful lives						P10Y
Building and improvements | Maximum
Estimated useful lives						P50Y
Machinery and equipment | Minimum
Estimated useful lives						P2Y
Machinery and equipment | Maximum
Estimated useful lives						P20Y
Furniture, fixtures, software and office equipment | Minimum
Estimated useful lives						P2Y
Furniture, fixtures, software and office equipment | Maximum
Estimated useful lives						P5Y
Demonstration units
Estimated useful lives						P5Y
Subsequent Events | Lumentum
Percentage of outstanding shares distributed	80.10%
Ownership percentage	19.90%