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WARRANTY LIABILITY - Narrative (Details)
9 Months Ended
Jun. 30, 2020
DE | Minimum  
Product Warranty Liability [Line Items]  
Product warranty period 1 year
DE | Maximum  
Product Warranty Liability [Line Items]  
Product warranty period 2 years
HBP | Minimum  
Product Warranty Liability [Line Items]  
Product warranty period 1 year
HBP | Maximum  
Product Warranty Liability [Line Items]  
Product warranty period 10 years
CPP  
Product Warranty Liability [Line Items]  
Product warranty period 90 days