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EMPLOYEE BENEFIT PLANS - Share-Based Incentive Plans (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 19, 2017
shares
Aug. 31, 2015
Sep. 30, 2024
USD ($)
Jun. 30, 2024
director
$ / shares
Sep. 30, 2023
USD ($)
Jun. 30, 2023
director
$ / shares
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Excess tax benefits recorded | $     $ 0   $ 0   $ 21,921,000 $ 7,299,000
Compensation expenses | $     45,325,000   42,740,000   78,396,000 82,149,000
Unrecognized compensation cost | $     $ 418,918,000   $ 463,603,000   $ 418,918,000 $ 463,603,000
Unrecognized compensation cost, period for recognition             1 year 4 months 24 days 3 years 4 months 24 days
Increase (reduction) to common stock available for issuance (in shares) 12,200,000              
Common stock available for issuance (in shares) 8,000,000.0              
Increase (reduction) to common stock available for issuance (in shares) (12,200,000)              
Annual increase to number of shares available for issuance (as a percent) 6.00%              
2016 Incentive Plan | Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period   4 years            
2016 Incentive Plan | Director | Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of independent director recipients | director       6   6    
Aggregate shares granted, price per share (in dollars per share) | $ / shares       $ 134.08   $ 87.60    
Class A Common Stock | April 1, 2018 | Amended And Restated 2016 Incentive Award Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase (reduction) to common stock available for issuance (in shares) (6,540,659)              
Increase (reduction) to common stock available for issuance (in shares) 6,540,659              
Common Class B | April 1, 2018 | Amended And Restated 2016 Incentive Award Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase (reduction) to common stock available for issuance (in shares) (6,540,659)              
Increase (reduction) to common stock available for issuance (in shares) 6,540,659