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DERIVATIVE INSTRUMENTS - CREDIT RISK EXPOSURE (Details)
$ in Thousands
6 Months Ended
Mar. 31, 2023
USD ($)
Credit Risk Exposure [Line Items]  
Gross Credit Exposure $ 181,505
Investment grade  
Credit Risk Exposure [Line Items]  
Gross Credit Exposure 126,575
Noninvestment grade  
Credit Risk Exposure [Line Items]  
Gross Credit Exposure 13,009
Internally rated investment grade  
Credit Risk Exposure [Line Items]  
Gross Credit Exposure 15,514
Internally rated noninvestment grade  
Credit Risk Exposure [Line Items]  
Gross Credit Exposure $ 26,407