Quarterly report pursuant to Section 13 or 15(d)

Investment in Derivative Instruments (Details)

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Investment in Derivative Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) $ 1,228 $ 139 $ 1,176 $ (254)  
Unrealized Gain (Loss) 459 764 2,589 3,141  
Total Gain (Loss) 1,687 903 3,765 2,887  
Net unrealized gain position 15,355   15,355   $ 967
Other Assets | Cash Flow Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 11,767   11,767   0
Other Long-Term Liabilities | Cash Flow Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liabilities, fair value 0   0   (31)
Commodity Swap | Prepaid Expenses and Other Current Assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 2,737   2,737   990
Commodity Swap | Other Assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 814   814   822
Commodity Swap | Accrued Expense and Other Current Liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liabilities, fair value (3)   (3)   0
Commodity Swap | Other Long-Term Liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liabilities, fair value (815)   (815)   0
Interest Rate Swap | Other Assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 12,622   12,622   0
Interest Rate Swap | Accrued Expense and Other Current Liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liabilities, fair value 0   0   (97)
Interest Rate Swap | Other Long-Term Liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liabilities, fair value 0   0   $ (748)
Cost of revenues          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) 1,349 302 2,206 257  
Unrealized Gain (Loss) 143 632 921 2,390  
Total Gain (Loss) 1,492 934 3,127 2,647  
Interest expense, net          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) (121) (163) (1,030) (511)  
Unrealized Gain (Loss) 316 132 1,668 751  
Total Gain (Loss) $ 195 $ (31) $ 638 $ 240