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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of COVID-19 (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 03, 2020 | Sep. 02, 2020
--- | --- | --- | ---
Money Market Funds |  |  |
Cash | $ 4.0 |  |
Fourth Amended Credit Facility |  |  |
Remaining available borrowings | $ 70.0 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 270.0 |
Fourth Amended Credit Facility | COVID-19 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 270.0 | $ 241.3
Line of Credit Facility, Additional Borrowing Capacity |  | $ 75.0 |

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