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Income Taxes (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Aug. 01, 2015
Jul. 02, 2016
Jun. 27, 2015
Jun. 28, 2014
Net operating loss carryforwards        
Capital losses generated   $ 393.0    
Portion of net operating loss carryforwards, when realized, will be credited to additional paid-in-capital   106.4    
Undistributed earnings of certain foreign subsidiaries   319.6    
Estimated additional U.S. income or foreign withholding taxes that would have to be provided if earnings of foreign subsidiaries were repatriated to the U.S.   17.0    
Increase (decrease) in deferred tax asset valuation allowances   (160.2) $ 12.6 $ (12.1)
Valuation allowance attributable to pre-fiscal 2006 windfall stock option deductions   514.7    
Uncertain tax expense benefit related to foreign deferred tax assets from expeiration of statute of limitations     21.7  
Income tax benefit intraperiod tax allocation related to other comprehensive income     6.4  
Portion of unrecognized tax benefits, if recognized, would impact the effective tax rate   3.0    
Portion of unrecognized tax benefits, if recognized, would impact the valuation allowance   38.7    
Accrued interest and penalties related to unrecognized tax benefits   1.7 $ 1.6  
Decrease in accrued interest and penalties related to unrecognized tax benefits   0.1    
Unrecognized tax benefits that may be recognized during the next twelve months   1.0    
Federal        
Net operating loss carryforwards        
Research and other tax credit carryforwards   100.7    
Operating loss carryforwards utilized $ 1,026.0      
State        
Net operating loss carryforwards        
Research and other tax credit carryforwards   39.6    
Operating loss carryforwards utilized $ 226.0      
Foreign        
Net operating loss carryforwards        
Research and other tax credit carryforwards   $ 0.7