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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Mar. 28, 2020
Jun. 29, 2019
May 31, 2019
Oct. 30, 2018
Business Acquisition [Line Items]        
Goodwill $ 376.2 $ 381.1    
3Z Telecom, Inc.        
Business Acquisition [Line Items]        
Tangible assets acquired     $ 4.1  
Goodwill     12.2  
Total consideration transferred     28.7  
3Z Telecom, Inc. | Developed technology        
Business Acquisition [Line Items]        
Intangible assets acquired     4.4  
3Z Telecom, Inc. | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets acquired     7.9  
3Z Telecom, Inc. | Customer Backlog        
Business Acquisition [Line Items]        
Intangible assets acquired     $ 0.1  
RPC Photonics, Inc.        
Business Acquisition [Line Items]        
Tangible assets acquired       $ 5.7
Goodwill       33.9
Total consideration transferred       69.6
RPC Photonics, Inc. | Developed technology        
Business Acquisition [Line Items]        
Intangible assets acquired       15.7
RPC Photonics, Inc. | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets acquired       14.0
RPC Photonics, Inc. | Customer Backlog        
Business Acquisition [Line Items]        
Intangible assets acquired       $ 0.3