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Assets Held For Sale and Related Dispositions - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations      
Gain (loss) on disposal of asset $ 14.5 $ 0.0 $ 0.0
Discontinued Operations, Held-for-sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations      
Assets held-for-sale 0.4    
Lithium Niobate | Discontinued Operations, Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations      
Sale of product lines 17.0    
Proceeds from sale of product lines 16.9    
Remaining holdback 0.1    
Gain (loss) on disposal of asset 13.8    
Assets of disposal group 6.6    
Liabilities of disposal group 3.5    
Gain on manufacturing licenses 0.7    
Datacom | Discontinued Operations, Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations      
Sale of product lines 3.0    
Impairment of assets to be disposed of 1.6    
Datacom | Discontinued Operations, Held-for-sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations      
Property, plant and equipment, net $ 0.3 $ 4.9