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Fair Value Measurements
9 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following table presents the Company’s liabilities measured at fair value on a recurring basis as of June 30, 2023 and September 30, 2022 under ASC 820, Fair Value Measurements (in thousands):

June 30, 2023September 30, 2022
(unaudited)
Level 2Level 2
Assets:
Commodity swap contracts$16 $1,187 
Interest rate swaps24,478 24,719 
Corporate debt securities4,532 2,537 
U.S. government securities5,832 2,481 
Municipal government securities1,842 1,055 
Agency backed securities1,147 793 
Total assets37,847 32,772 
Liabilities:
Commodity swap contracts$898 $661 
Total liabilities$898 $661 

The fair value of interest rate swap contracts is based on a model-driven valuation using the observable components (e.g., interest rates), which are observable at commonly quoted intervals for the full term of the contracts. The fair value of the Company’s commodity swap contracts is based on an analysis of the expected cash flow of the contract in combination with observable forward price inputs obtained from a third-party pricing source. The calculations are adjusted for credit risk. Therefore, the Company’s derivative assets and liabilities are classified within Level 2 of the fair value hierarchy. Derivative assets are included within “Prepaid expenses and other current assets” and “Other assets” on the Company’s Consolidated Balance Sheets. Derivative liabilities are included within “Accrued expense and other current liabilities” and “Other long-term liabilities” on the Company’s Consolidated Balance Sheets.