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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2015 | Jan. 31, 2020
Derivative |  |  |  |  |
Net unrealized gains (losses) arising during the period | $ (918) | $ (742) |  |  |
Reclassification adjustments increased interest expense on a net basis | 54 | (1,527) |  |  |
Treasury lock | Portion of senior notes |  |  |  |  |
Derivative |  |  |  |  |
Reclassification adjustments increased interest expense on a net basis | 300 | $ 100 |  |  |
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts | Treasury lock |  |  |  |  |
Derivative |  |  |  |  |
Net unrealized gains (losses) arising during the period |  |  | $ (13,600) | $ 7,500 |
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts | Treasury lock | 2020 Rate Lock Agreements |  |  |  |  |
Derivative |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 350,000
Net unrealized gains (losses) arising during the period | (21,500) |  |  |  |
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts | Treasury lock | Portion of senior notes |  |  |  |  |
Derivative |  |  |  |  |
Unamortized portion of the fair value of derivative contracts | $ 29,800 |  |  |  |
Maximum | Derivatives designated as hedging instruments | Cash flow hedge contracts | Treasury lock |  |  |  |  |
Derivative |  |  |  |  |
Term of contract | 18 months |  |  |  |

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