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BUSINESS COMBINATIONS (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jul. 02, 2019
Nov. 09, 2018
Oct. 01, 2018
Apr. 30, 2018
Dec. 27, 2019
Sep. 27, 2019
Jun. 28, 2019
Mar. 29, 2019
Dec. 28, 2018
Sep. 28, 2018
Jun. 29, 2018
Mar. 30, 2018
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
BUSINESS COMBINATIONS                              
Par value (in dollars per share)         $ 0.01       $ 0.01       $ 0.01 $ 0.01  
Cash paid at closing                         $ 27,000    
Revenues.         $ 129,416 $ 117,494 $ 104,396 $ 91,793 $ 86,438 $ 71,386 $ 59,833 $ 54,595 443,099 $ 272,252 $ 273,352
Cash paid                         71,756 124,344 $ 14,603
Onsite Energy Corporation                              
BUSINESS COMBINATIONS                              
Aggregate Purchase price $ 24,905                            
Revenues.                         7,700    
Cash paid 24,411                            
Lime Energy                              
BUSINESS COMBINATIONS                              
Proceeds from equity raise   $ 50,000                          
Aggregate Purchase price   120,000 $ 122,439                        
Cash paid at closing   $ 56,400                          
Revenues.                         $ 158,700 $ 181,500  
Cash paid     $ 122,439                        
NAM | Maximum                              
BUSINESS COMBINATIONS                              
Aggregate Purchase price       $ 4,000                      
Willdan Energy Solutions | Onsite Energy Corporation | Maximum                              
BUSINESS COMBINATIONS                              
Aggregate Purchase price $ 26,400