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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 21, 2019
Jun. 03, 2019
Oct. 01, 2018
Sep. 30, 2019
Mar. 27, 2020
Mar. 29, 2019
Business Acquisition [Line Items]            
Acquisition of businesses, net of cash acquired         $ 0 $ 57,899
Goodwill       $ 186,231 $ 186,779  
Rocky Mountain Pipe (Cor-Tek)            
Business Acquisition [Line Items]            
Purchase price $ 14,835          
Business combination, bargain purchase, gain recognized, amount       7,384    
United Structural Products, LLC.            
Business Acquisition [Line Items]            
Acquisition of businesses, net of cash acquired   $ 25,507        
Goodwill   7,295        
Identifiable intangible assets   14,800        
Working capital and other tangible assets   $ 3,412        
Vergokan            
Business Acquisition [Line Items]            
Acquisition of businesses, net of cash acquired     $ 57,899      
Goodwill       $ 9,629