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Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis The following table presents the Company’s liabilities measured at fair value on a recurring basis as of March 31, 2023 and September 30, 2022 under ASC 820, Fair Value Measurements (in thousands):
March 31, 2023September 30, 2022
(unaudited)
Level 2Level 2
Assets:
Commodity swap contracts$— $1,187 
Interest rate swaps18,882 24,719 
Corporate debt securities3,716 2,537 
U.S. government securities5,626 2,481 
Municipal government securities1,072 1,055 
Agency backed securities889 793 
Total assets30,185 32,772 
Liabilities:
Commodity swap contracts$1,760 $661 
Total liabilities$1,760 $661