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Fair Value Measurements: Fair Value Measurements, Nonrecurring, Valuation Techniques (Details) - Nonrecurring - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Assets, estimated fair value, nonrecurring $ 1,847 $ 122
Fair Value, Inputs, Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Assets, estimated fair value, nonrecurring $ 1,847 $ 122