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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jun. 27, 2015
Changes in accumulated other comprehensive income (loss) by component      
Balance $ 689.3 $ 1,101.4 $ 1,187.7
Other comprehensive income (loss) before reclassification 97.6    
Amounts reclassified from accumulated other comprehensive income (200.0)    
Net change in accumulated other comprehensive (loss) income (102.4) 65.8 (59.1)
Balance 786.4 689.3 1,101.4
Unrealized net actuarial gain 2.1    
Tax expense for unrealized net actuarial gains 1.4    
Marketable equity securities | Lumentum      
Changes in accumulated other comprehensive income (loss) by component      
Unrealized gain on marketable equity securities 92.6    
Tax impact for unrealized holding gains on marketable equity securities 0.0    
Total      
Changes in accumulated other comprehensive income (loss) by component      
Balance 10.0 (48.0) 11.1
Net change in accumulated other comprehensive (loss) income (102.4) 65.8 (59.1)
Balance (92.4) 10.0 $ (48.0)
Unrealized gains (losses) on available-for-sale investments      
Changes in accumulated other comprehensive income (loss) by component      
Balance 104.5    
Other comprehensive income (loss) before reclassification 92.1    
Amounts reclassified from accumulated other comprehensive income (201.9)    
Net change in accumulated other comprehensive (loss) income (109.8)    
Balance (5.3) 104.5  
Foreign currency translation adjustments, net of tax      
Changes in accumulated other comprehensive income (loss) by component      
Balance (70.1)    
Other comprehensive income (loss) before reclassification 4.8    
Amounts reclassified from accumulated other comprehensive income 0.0    
Net change in accumulated other comprehensive (loss) income 4.8    
Balance (65.3) (70.1)  
Defined benefit obligation, net of tax      
Changes in accumulated other comprehensive income (loss) by component      
Balance (24.4)    
Other comprehensive income (loss) before reclassification 0.7    
Amounts reclassified from accumulated other comprehensive income 1.9    
Net change in accumulated other comprehensive (loss) income 2.6    
Balance $ (21.8) $ (24.4)