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GOODWILL AND OTHER INTANGIBLE ASSETS - Gross Amount and Amortization (Details) - USD ($)
 12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
Goodwill and other intangible assets      
Gross Amount $ 98,158,000 $ 52,374,000  
Gross Amount of Intangible Assets 98,158,000 54,064,000  
Accumulated Amortization 21,321,000 9,700,000  
Amortization expense for acquired identifiable intangible assets 11,600,000 4,500,000 $ 2,400,000
Estimated amortization expense for acquired identifiable intangible assets      
2020 13,025,000    
2021 11,622,000    
2022 11,233,000    
2023 9,962,000    
2024 6,871,000    
Thereafter 24,124,000    
Total estimated amortization expense 76,837,000    
Goodwill impairment      
Goodwill impairment 0 0 $ 0
Backlog      
Goodwill and other intangible assets      
Gross Amount 7,134,000 2,514,000  
Accumulated Amortization $ 3,763,000 2,155,000  
Amortization Period (in years) 1 year    
Tradename      
Goodwill and other intangible assets      
Gross Amount $ 13,351,000 10,301,000  
Accumulated Amortization $ 4,882,000 3,118,000  
Tradename | Minimum      
Goodwill and other intangible assets      
Amortization Period (in years) 2 years 6 months    
Tradename | Maximum      
Goodwill and other intangible assets      
Amortization Period (in years) 6 years    
Non-compete agreements      
Goodwill and other intangible assets      
Gross Amount $ 2,320,000 1,420,000  
Accumulated Amortization $ 1,384,000 1,042,000  
Non-compete agreements | Minimum      
Goodwill and other intangible assets      
Amortization Period (in years) 4 years    
Non-compete agreements | Maximum      
Goodwill and other intangible assets      
Amortization Period (in years) 5 years    
Developed technology      
Goodwill and other intangible assets      
Gross Amount $ 14,620,000 12,920,000  
Accumulated Amortization $ 3,227,000 944,000  
Amortization Period (in years) 8 years    
In-process research and technology      
Goodwill and other intangible assets      
Gross Amount of Indefinite Lived Intangible Assets   1,690,000  
Customer relationships      
Goodwill and other intangible assets      
Gross Amount $ 60,733,000 25,219,000  
Accumulated Amortization $ 8,065,000 $ 2,441,000  
Customer relationships | Minimum      
Goodwill and other intangible assets      
Amortization Period (in years) 5 years    
Customer relationships | Maximum      
Goodwill and other intangible assets      
Amortization Period (in years) 8 years