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MARKETING AGREEMENT - Additional Information (Details)
 3 Months Ended 12 Months Ended
Aug. 01, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Schedule of Costs Related to Purchase Obligations [Line Items]          
Net sales     $ 4,925,000,000 $ 4,131,600,000 $ 3,156,000,000
Restated Marketing Agreement          
Schedule of Costs Related to Purchase Obligations [Line Items]          
Commission threshold, percentage of program earnings 50.00%        
Commission threshold $ 40,000,000.0        
Annual contribution payment 18,000,000.0        
Third Restated Agreement          
Schedule of Costs Related to Purchase Obligations [Line Items]          
Minimum EBIT to avoid reduction of contribution payment 36,000,000.0        
Net sales   $ 20,000,000.0      
Minimum EBIT 50,000,000.0        
Minimum termination fee payable 175,000,000.0        
Brand decommissioning event payable $ 375,000,000.0        
Minimum termination fee payable, multiple of average program earnings, prior 3 years 4        
Minimum termination fee payable, threshold $ 186,400,000        
Brand Extension Asset Purchase Agreement          
Schedule of Costs Related to Purchase Obligations [Line Items]          
Proceeds from sale of productive assets 112,000,000.0        
Disposal group, inventory 3,500,000        
Disposal group, assets $ 111,700,000