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EMPLOYEE BENEFIT PLANS - Share-Based Incentive Plans (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2015
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Oct. 24, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expenses   $ 46,632,000 $ 45,325,000 $ 88,852,000 $ 78,396,000  
Unrecognized compensation cost   $ 401,499,000 $ 418,918,000 $ 401,499,000 $ 418,918,000  
Unrecognized compensation cost, period for recognition       2 years 4 months 24 days 1 year 4 months 24 days  
Common stock available for issuance (in shares)           8,000,000
Increase to common stock available for issuance (in shares)           4,231,218
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Excess tax benefits recorded       $ 30,562,000 $ 21,921,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period       4 years    
2016 Incentive Plan | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period 4 years