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Acquisitions - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
Jan. 02, 2019
USD ($)
Oct. 30, 2017
USD ($)
Aug. 14, 2017
USD ($)
Jul. 05, 2017
USD ($)
facility
Sep. 30, 2019
USD ($)
Dec. 28, 2019
USD ($)
Dec. 30, 2017
USD ($)
Dec. 30, 2017
USD ($)
Dec. 28, 2019
USD ($)
Dec. 29, 2018
USD ($)
Dec. 30, 2017
USD ($)
Business Acquisition [Line Items]                      
Payments to acquire businesses, net                 $ 177,798 $ 0 $ 204,731
Goodwill           $ 336,032 $ 268,001 $ 268,001 336,032 258,174 268,001
Acquisition transaction costs                 843 1,321 5,375
Goodwill, period decrease                 (77,858) $ 9,827  
Syntron Material Handling Group, LLC                      
Business Acquisition [Line Items]                      
Payments to acquire businesses, net $ 176,855                    
Goodwill 78,592                    
Goodwill, expected tax deductible amount $ 59,195                    
Deferred income tax payments, period 15 years                    
Intangible assets other than goodwill acquired $ 83,020                    
Intangible assets other than goodwill, expected tax deductible amount $ 69,969                    
Acquired intangible assets other than goodwill income tax payments, period (years) 15 years                    
Revenue from the date of acquisition                 83,364    
Operating income from date of acquisition                 3,132    
Amortization expense                 4,872    
Acquisition transaction costs                 $ 843    
Goodwill, period decrease           $ 1,704          
Cash paid to seller borrowed under revolving credit facility $ 179,286                    
Unaflex                      
Business Acquisition [Line Items]                      
Goodwill     $ 15,640                
Intangible assets other than goodwill acquired     11,200                
Revenue from the date of acquisition             7,335        
Operating income from date of acquisition             187        
Amortization expense             $ 176        
Acquisition transaction costs     596                
Cash paid to seller borrowed under revolving credit facility     $ 31,274                
NII FPG                      
Business Acquisition [Line Items]                      
Payments to acquire businesses, net       $ 170,792              
Goodwill       85,432              
Goodwill, expected tax deductible amount       33,993              
Intangible assets other than goodwill acquired       72,812              
Intangible assets other than goodwill, expected tax deductible amount       10,044              
Revenue from the date of acquisition               48,363      
Operating income from date of acquisition               1,238      
Amortization expense               $ 6,399      
Acquisition transaction costs       4,764              
Cash paid to seller borrowed under revolving credit facility       $ 170,018              
Number of primary manufacturing facilities | facility       2              
NII FPG | Revolving credit facility | Canadian Denominated Borrowing                      
Business Acquisition [Line Items]                      
Cash paid to seller borrowed under revolving credit facility       $ 62,690              
NII FPG | Revolving credit facility | Euro-Denominated Borrowing                      
Business Acquisition [Line Items]                      
Cash paid to seller borrowed under revolving credit facility       $ 61,769              
Other                      
Business Acquisition [Line Items]                      
Goodwill   $ 716                  
Cash paid to seller borrowed under revolving credit facility   $ 2,500                 $ 2,500
Papermaking Systems                      
Business Acquisition [Line Items]                      
Payments to acquire productive assets         $ 407