Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 15,452 $ 15,079
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 5,773 5,605
Municipal government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,696 1,748
Agency backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,195 1,177
Fair Value, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 36,483 42,192
Liabilities 10 20
Fair Value, Recurring | Fair Value, Inputs, Level 2 | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 6,788 6,549
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 5,773 5,605
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Municipal government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,696 1,748
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Agency backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,195 1,177
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Commodity swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 204
Liabilities 10 20
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 21,031 $ 26,909