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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
 12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jul. 02, 2016
Changes in accumulated other comprehensive income (loss) by component      
Beginning balance $ 786,400,000 $ 689,300,000 $ 1,101,400,000
Other comprehensive (loss) income before reclassification (11,600,000)    
Amounts reclassified from accumulated other comprehensive (loss) income 1,600,000    
Net change in accumulated other comprehensive (loss) income (10,000,000) (102,400,000) 65,800,000
Ending balance 720,700,000 786,400,000 689,300,000
Unrealized actuarial loss 2,400,000    
Income tax benefit 400,000    
Available-for-sale securities | Lumentum      
Changes in accumulated other comprehensive income (loss) by component      
Tax impact from reclassification of gross realized gain from available-for-sale securities 0    
Total      
Changes in accumulated other comprehensive income (loss) by component      
Beginning balance (92,400,000) 10,000,000 (48,000,000)
Net change in accumulated other comprehensive (loss) income   (102,400,000) 65,800,000
Ending balance (102,400,000) (92,400,000) $ 10,000,000
Unrealized gains (losses) on available-for-sale investments      
Changes in accumulated other comprehensive income (loss) by component      
Beginning balance (5,300,000)    
Other comprehensive (loss) income before reclassification (600,000)    
Amounts reclassified from accumulated other comprehensive (loss) income 100,000    
Net change in accumulated other comprehensive (loss) income (500,000)    
Ending balance (5,800,000) (5,300,000)  
Foreign currency translation adjustments      
Changes in accumulated other comprehensive income (loss) by component      
Beginning balance (65,300,000)    
Other comprehensive (loss) income before reclassification (8,200,000)    
Amounts reclassified from accumulated other comprehensive (loss) income 0    
Net change in accumulated other comprehensive (loss) income (8,200,000)    
Ending balance (73,500,000) (65,300,000)  
Change in unrealized components of defined benefit obligations, net of tax      
Changes in accumulated other comprehensive income (loss) by component      
Beginning balance (21,800,000)    
Other comprehensive (loss) income before reclassification (2,800,000)    
Amounts reclassified from accumulated other comprehensive (loss) income 1,500,000    
Net change in accumulated other comprehensive (loss) income (1,300,000)    
Ending balance $ (23,100,000) $ (21,800,000)