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SEGMENT INFORMATION - Concentrations of Credit Risk (Details) - Customer Concentration Risk
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Net Sales | Home Depot      
Revenue, Major Customer [Line Items]      
Concentration risk (percent) 24.00% 26.00% 30.00%
Net Sales | Lowe's      
Revenue, Major Customer [Line Items]      
Concentration risk (percent) 15.00% 18.00% 19.00%
Net Accounts Receivable | Two Largest Customers      
Revenue, Major Customer [Line Items]      
Concentration risk (percent) 42.00% 58.00%