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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 11,303 | $ 6,866
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 3,716 | 2,537
Municipal government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 1,072 | 1,055
Agency backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 889 | 793
Fair Value, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 30,185 | 32,772
Liabilities | 1,760 | 661
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 | 3,716 | 2,537
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 | 5,626 | 2,481
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 | 1,072 | 1,055
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 | 889 | 793
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 | 1,187
Liabilities | 1,760 | 661
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 | $ 18,882 | $ 24,719

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