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DERIVATIVE INSTRUMENTS - EFFECT OF DERIVATIVE INSTRUMENTS DESIGNATED AS CASH FLOW HEDGES ON OCI (Details) - Treasury Lock - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative [Line Items]        
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) $ (807) $ 0 $ (13,299) $ 0
Interest expense        
Derivative [Line Items]        
Amount of Gain or (Loss) Reclassified from OCI into Income (Effective Portion) $ 0 $ 0 $ 0 $ 0