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EMPLOYEE BENEFIT PLANS - Share-Based Incentive Plans (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Oct. 19, 2017 | Aug. 31, 2015 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Excess tax benefits recorded |  |  | $ 7,299,000 | $ 8,102,000 |  |
Compensation expenses |  |  | 42,740,000 | 41,399,000 | $ 82,149,000 | $ 82,006,000
Unrecognized compensation cost |  |  | $ 463,603,000 | $ 519,704,000 | $ 463,603,000 | $ 519,704,000
Unrecognized compensation cost, period for recognition |  |  |  |  | 3 years 4 months 24 days | 2 years 9 months 18 days
Increase (reduction) to common stock available for issuance (in shares) | 12,200,000 |  |  |  |  |
Common stock available for issuance (in shares) | 8,000,000 |  |  |  |  |
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% |  |  |  |  |
2006 Incentive Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate shares granted, price per share (in dollars per share) |  |  |  |  | $ 87.60 | $ 84.49
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] |  |  |  |  |  |
Aggregate shares granted, price per share (in dollars per share) |  |  | $ 87.60 | $ 84.55 |  |
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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