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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 |  |  |  |  |  |  |

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