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DEBT AND CREDIT SOURCES - Convertible Debt (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 17, 2020
USD ($)
d
$ / shares
shares
Jan. 02, 2022
USD ($)
Jan. 03, 2021
USD ($)
Debt Instrument [Line Items]      
Threshold trading days | d 60    
Interest expense   $ 2,600 $ 1,700
Convertible debt | Green Convertible Notes      
Debt Instrument [Line Items]      
Principal amount $ 200,000    
Stated percentage 6.50%    
Conversion price (USD per share) | $ / shares $ 18.19    
Conversion ratio, number of shares (in shares) | shares 54.9611    
Conversion ratio, principal amount $ 1    
Threshold percentage of stock price trigger 130.00%    
Convertible debt   145,800 135,100
Equity component of convertible debt   52,200 52,200
Unamortized discount   $ 45,500 53,800
Effective percentage   15.70%  
Debt issuance cost   $ 8,700 11,100
Interest expense   23,700 10,400
If-converted value (below) in excess of principal   (47,200) 111,900
Convertible debt | Green Convertible Notes | Level 2      
Debt Instrument [Line Items]      
Fair value of debt   $ 218,500 $ 325,100