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ORGANIZATION AND OPERATIONS OF THE COMPANY - Accounting for Contracts (Details)
 12 Months Ended
Dec. 27, 2019
USD ($)
segment
Dec. 28, 2018
USD ($)
Dec. 29, 2017
USD ($)
Accounting for Contracts      
Number of reportable segments | segment 2    
Costs of contract revenue      
Payroll taxes, bonuses and employee benefit costs for all Company personnel $ 66,303,000 $ 45,248,000 $ 36,534,000
Facilities costs 8,568,000 5,600,000 $ 4,624,000
Revenue of the entity recorded in which it acts solely in the capacity of an agent 0    
Costs recorded for costs to the entity in which it acts solely in the capacity of an agent $ 0    
Maximum      
Costs of contract revenue      
Percent of revenue (as a percent) 3.00%    
Minimum      
Costs of contract revenue      
Percent of revenue (as a percent) 2.00%    
Accounts receivable      
Costs of contract revenue      
Retained accounts receivable $ 5,400,000 $ 6,700,000  
Cost of Sales      
Costs of contract revenue      
Payroll taxes, bonuses and employee benefit costs for all Company personnel 0    
Facilities costs $ 0