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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 29, 2024 | May 31, 2018 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Number of Shares |  |  |  |  |  |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  |  |  | $ 28,100,000 | $ 28,100,000
Unrecognized compensation expense |  |  | $ 77,500,000 |  | $ 77,500,000 |
Unrecognized compensation expense, period for recognition |  |  |  |  | 2 years |
Employee Stock |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 600,000 | $ 1,100,000 | $ 1,700,000 | 2,400,000
Maximum percentage of annual salary that an employee is permitted to utilize to purchase stock |  | 10.00% |  |  |  |
Maximum number of shares that a participant can purchase during any single offering period |  | 312 |  |  |  |
Maximum fair market value of stock an employee can purchase under the plan per calendar year |  | $ 25,000 |  |  |  |
Exercise price per share of common stock as a percent of fair market value |  | 85.00% |  |  |  |
Shares reserved for future issuance |  |  | 441,140 |  | 441,140 |
Number of shares of common stock made available for purchase to employees |  | 750,000 |  |  |  |
RSUs |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  |  | 1 |  | 1 |
Vesting period (in years) |  |  |  |  | 3 years |
Qualified retirement eligibility age for grants awarded between 2017 and 2023 |  |  |  |  | 55 years |
Qualified retirement eligibility number of years of service for grants awarded between 2017 and 2023 |  |  |  |  | 10 years |
Shares purchased to satisfy the employee income tax withholdings (in shares) |  |  |  |  | 95,036 |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  |  |  | $ 20,500,000 |
Shares vested, prompting share repurchases to cover employees' tax obligations |  |  |  |  | 242,003 |
Vested (in shares) |  |  |  |  | 249,133 |
RSUs | Minimum |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Period of advance notice required in or after 2024 (in months) |  |  |  |  | 6 months |
PSUs |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  |  | 1 |  | 1 |
Vesting period (in years) |  |  |  |  | 3 years |
Shares purchased to satisfy the employee income tax withholdings (in shares) |  |  |  |  | 35,067 |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  |  |  | $ 7,600,000 |
Vested (in shares) |  |  |  |  | 85,901 |
PSUs | Minimum |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Risk-free interest rate (in percent) | 3.71% |  |  |  |  |
Expected volatility (in percent) | 20.53% |  |  |  |  |
Correlation with S&P 500 index | (0.08) |  |  |  |  |
Units ultimately expected to be awarded (in percent) |  |  |  |  | 0.00% |
PSUs | Maximum |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Risk-free interest rate (in percent) | 4.25% |  |  |  |  |
Expected volatility (in percent) | 21.11% |  |  |  |  |
Correlation with S&P 500 index | 0.19 |  |  |  |  |
Units ultimately expected to be awarded (in percent) |  |  |  |  | 200.00% |
Employee |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 11,400,000 | 9,600,000 | $ 35,400,000 | 30,900,000
Nonemployee |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 500,000 | $ 500,000 | $ 1,500,000 | $ 1,200,000
Nonemployee | RSUs |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 1 year |

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