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Subsequent Events - (Details)
3 Months Ended 12 Months Ended
Jan. 02, 2019
USD ($)
Dec. 31, 2018
USD ($)
Employee
Dec. 29, 2018
USD ($)
Dec. 29, 2018
USD ($)
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Subsequent Event [Line Items]            
Acquisition transaction costs       $ 1,321,000 $ 5,375,000 $ 1,832,000
Syntron Material Handling Group, LLC | Subsequent event            
Subsequent Event [Line Items]            
Purchase price $ 179,000,000          
Revenues   $ 89,365,000        
Number of employees | Employee   250        
Selling, general and administrative expenses | Syntron Material Handling Group, LLC            
Subsequent Event [Line Items]            
Acquisition transaction costs     $ 1,321,000      
Revolving credit facility | 2018 Credit Agreement | Subsequent event            
Subsequent Event [Line Items]            
Principal amount   $ 180,000,000