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Acquisition - Acquisition of Syntron Material Handling Group, LLC (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 02, 2019
Mar. 30, 2019
Mar. 31, 2018
Oct. 31, 2018
Dec. 29, 2018
Business Acquisition [Line Items]          
Acquisition transaction costs   $ 843,000      
Payments to acquire business, net   175,288,000 $ 0    
Goodwill   343,768,000     $ 258,174,000
Syntron Material Handling Group, LLC          
Business Acquisition [Line Items]          
Acquisition transaction costs   843,000      
Payments to acquire business, net $ 176,855,000        
Post-closing adjustment to be paid to seller 1,567,000        
Revenues       $ 89,365,000  
Goodwill 86,502,000        
Goodwill, expected tax deductible amount 64,438,000        
Intangible assets other than goodwill acquired 77,140,000        
Intangible assets other than goodwill, expected tax deductible amount $ 66,725,000        
Acquired intangible assets other than goodwill income tax payments, period (years) 15 years        
Deferred income tax payments, period (years) 15 years        
Revenues from the date of acquisition   20,584,000      
Operating income from the date of acquisition   1,353,000      
Amortization expense   $ 3,308,000