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Guarantees - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Guarantor Obligations [Line Items]    
Outstanding standby letters of credit $ 3.8 $ 4.2
Debt instrument, collateral amount 5.0 5.2
Banker's guarantees or performance bonds    
Guarantor Obligations [Line Items]    
Line of credit facility, remaining borrowing capacity 1.6 1.6
Proceeds from lines of credit 0.0 0.0
Letter of credit    
Guarantor Obligations [Line Items]    
Customer performance guarantee 1.9 2.2
Value added tax license 1.2 1.3
Property leases $ 0.7 $ 0.7