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SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]      
Debt issuance costs $ 35.6 $ 36.5  
Expected returns liability 11.8 12.8  
Shipping and handling costs 216.3 172.8 $ 162.9
Advertising costs $ 54.0 40.7 28.1
Percentage greater than the largest amount of recognized income tax positions which likely of being realized 50.00%    
Exchange losses on foreign currency transactions $ 1.5 $ 7.1 $ 40.5