Post-effective amendment to a registration statement that is not immediately effective upon filing

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 25, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jun. 25, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Conversion basis for conversion of the then-issued and outstanding ordinary shares of predecessor into successor shares (in shares) 1                
Shares issued (in shares) 7,500,000                
Private placement warrants issued (in shares) 5,263,500                
Shares called upon by private placement warrants (in shares) 2,631,750       2,631,750        
Operating profit   $ (3,064,000) $ (33,322,000) $ (6,106,000) $ (38,181,000)   $ 29,676,000 $ 27,752,000  
Reclassification from accumulated other comprehensive income   (6,567,000)   (8,605,000)   $ (8,605,000) 0    
Workers compensation and group medical liabilities       500,000   $ 500,000 700,000    
Advertising expense       6,200,000 4,800,000   11,900,000 16,100,000  
Total foreign exchange gains (losses), tax       (900,000) 500,000   (2,000,000.0) (1,900,000)  
Expense related to remeasurement adjustments       300,000 0   0    
Restructuring and other non-recurring expenses   1,657,000 0 1,052,000 0   2,193,000 9,461,000  
Minimum | Buildings                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Property, plant and equipment, useful life           3 years      
Minimum | Property, Plant and Equipment, Other Types                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Property, plant and equipment, useful life           1 year      
Maximum | Buildings                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Property, plant and equipment, useful life           40 years      
Maximum | Property, Plant and Equipment, Other Types                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Property, plant and equipment, useful life           14 years      
Employee Severance                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Restructuring and other non-recurring expenses       $ 1,100,000     600,000 3,100,000  
Facility Closing                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Restructuring and other non-recurring expenses   $ 1,700,000       $ 0      
Facility Closing | Merisant                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Restructuring and other non-recurring expenses             800,000 1,900,000  
Facility Closing | Mafco Worldwide                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Restructuring and other non-recurring expenses             $ 800,000 $ 4,500,000  
Common Stock                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Conversion basis for conversion of the then-issued and outstanding ordinary shares of predecessor into successor shares (in shares) 1                
Shares issued (in shares) 7,500,000                
Restatement adjustment | ASU 2017-07                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Operating profit     $ 100,000   $ 100,000        
Restatement adjustment | ASU 2018-02                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Reclassification from accumulated other comprehensive income                 $ 2,100,000