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Commitments and Contingencies - Leases (Details) - Facilities Vehicles and Equipment [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Operating Leased Assets [Line Items]      
Lease payments scheduled for 2018 $ 7.0    
Lease payments scheduled for 2019 5.2    
Lease payments scheduled for 2020 4.4    
Lease payments scheduled for 2021 3.5    
Lease payments scheduled for 2022 3.1    
Lease payments scheduled after 2022 17.3    
Lease expense $ 11.9 $ 11.6 $ 9.7