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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, Fair Value of Financial Instruments (Details) $ in Millions |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2023 Clinic | May 31, 2023 Clinic | Feb. 28, 2023 Clinic | Nov. 30, 2022 Clinic | Oct. 31, 2022 USD ($) Clinic | Sep. 30, 2022 Clinic | Aug. 31, 2022 Clinic | Mar. 31, 2022 Clinic | Sep. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) Clinic | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($)
Fair Value of Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in put right |  |  |  |  |  |  |  |  |  | $ 0.1 | $ 0.3 |  |
Put right value |  |  |  |  |  |  |  |  |  | $ 3.9 | $ 3.9 | $ 3.5 |
Number of clinics | Clinic |  |  |  |  |  |  |  |  |  |  | 672 |  |
Volatility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, measurement input |  |  |  |  |  |  |  |  |  | 0.25 | 0.25 |  |
Discount Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, measurement input |  |  |  |  |  |  |  |  |  | 0.119 | 0.119 |  |
Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 70.00% | 75.00% | 80.00% | 80.00% | 60.00% | 80.00% | 70.00% | 70.00% |  |  |  |
Number of clinics | Clinic |  | 5 | 4 | 1 | 13 | 14 | 2 | 6 | 6 |  |  |  |
Contingent payments |  |  |  |  |  | $ 8.1 |  |  |  | $ 8.1 | $ 8.1 | $ 8.3 |
Clinic Practice [Member] | Volatility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, measurement input |  |  |  |  |  |  |  |  |  | 0.35 | 0.35 |  |
Clinic Practice [Member] | Discount Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, measurement input |  |  |  |  |  |  |  |  |  | 0.087 | 0.087 |  |
October 2022 Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired | [1] |  |  |  |  |  |  |  |  | 60.00% | 60.00% |  |
Number of clinics | Clinic |  |  |  |  |  |  |  |  |  |  | 14 |  |
Contingent consideration decreased |  |  |  |  |  |  |  |  |  | $ (0.2) | $ (0.2) |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional value |  |  |  |  |  |  |  |  |  |  |  |  | $ 150.0
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2027 |  |
Interest rate derivative |  |  |  |  |  |  |  |  |  | 7.7 | $ 7.7 |  |
Unrealized gain from interest rate swap |  |  |  |  |  |  |  |  |  | $ 1.0 | $ 1.7 |  |
[1] | * See Note 3 for additional information on the acquisitions in the table.

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