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BASIS OF PRESENTATION AND SUMMARY OF ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Significant Accounting Policies [Line Items]        
Percentage of total annual net sales in the third and fourth quarters     62.00% 60.00%
Receivables Purchase Agreement        
Schedule Of Significant Accounting Policies [Line Items]        
Sale of receivables $ 40.6 $ 37.9    
Receivables sold outstanding 25.6 23.2    
Receivables Purchase Agreement | Selling, general and administrative expense        
Schedule Of Significant Accounting Policies [Line Items]        
Charge related to sale of receivables $ 0.1 $ 0.2