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SHARE-BASED AND OTHER COMPENSATION, Restricted Stock Award, Narrative (Details) - 2012 Stock Incentive Plan
12 Months Ended
Sep. 30, 2020
USD ($)
Restricted Stock and Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount $ 27,000,000
Employees and Directors | Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum percentage of annual bonus amounts in excess of specified amount that an employee can receive in stock awards, in lieu of cash 10.00%
Maximum percentage of annual bonus amounts in excess of specified amount that an employee can receive in stock awards, in lieu of cash 50.00%
Bonus amount that must be exceeded in order to receive awards in lieu of cash (greater than) $ 250,000
Award vesting period (in years) 1 year
Weighted-average period of recognition (in years) 3 years
Nonvested awards, compensation cost not yet recognized $ 176,000,000
Employees and Directors | Restricted Stock | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted period of awards 3 years
Employees and Directors | Restricted Stock | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted period of awards 5 years