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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 26, 2020
USD ($)
item
contract
Dec. 26, 2020
USD ($)
item
contract
shares
Dec. 28, 2019
USD ($)
shares
Dec. 29, 2018
shares
Summary of significant accounting policies        
Number of markets | item 3 3    
Options to purchase shares excluded from computation of EPS (in shares) | shares   0 0 0
Requisite ownership to consolidate (in hundredths) (or more) 50.00% 50.00%    
Length of fiscal year   364 days 364 days 364 days
Restricted investments $ 17,600 $ 17,600    
Accounts receivable retainage 8,700 $ 8,700 $ 7,400  
Accounts receivable retainage, collection period   18 months    
Concentration of accounts receivable related to largest customer 77,500 $ 77,500 42,800  
Inventory on consignment $ 20,800 $ 20,800 20,200  
Number of insurance contracts with third party by Ardellis | contract 45 45    
Reserve associated with contracts to third party by Ardellis $ 4,500 $ 4,500 5,700  
Goodwill        
Goodwill impairment   11,485    
New accounting pronouncement        
Retained earnings 1,182,680 1,182,680 995,022  
Right-of-use assets 77,245 77,245 $ 80,167  
Operating lease liability 78,058 $ 78,058    
Construction | Commercial        
Goodwill        
Goodwill impairment $ 11,500      
Minimum        
Summary of significant accounting policies        
Length of fiscal year   364 days    
Maximum        
Summary of significant accounting policies        
Length of fiscal year   371 days