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SHARE BASED COMPENSATION - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of options exercised $ 2,500,000 $ 100,000  
Cash settlement $ 3,400,000 300,000  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock Units | Specturm And SB/RH      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining unrecognized pre-tax compensation cost $ 34,600,000    
Restricted Stock Units | Annual Management Incentive Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total share based compensation expense $ 0 $ 0 $ 15,200,000