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 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) $ (67) $ (74) $ (52) $ (393)  
Unrealized Gain (Loss) 1,994 1,213 2,130 2,377  
Total Gain (Loss) 1,927 1,139 2,078 1,984  
Net unrealized gain position 12,565   12,565   $ 967
Other Assets | Cash Flow Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 9,437   9,437   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 2,616   2,616   990
Commodity Swap | Other Assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 39   39   822
Commodity Swap | Other Long-Term Liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liabilities, fair value (65)   (65)   0
Interest Rate Swap | Other Assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 9,991   9,991   0
Interest Rate Swap | Accrued Expense and Other Current Liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liabilities, fair value (16)   (16)   (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) 364 94 857 (45)  
Unrealized Gain (Loss) 1,055 813 778 1,758  
Total Gain (Loss) 1,419 907 1,635 1,713  
Interest expense, net          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) (431) (168) (909) (348)  
Unrealized Gain (Loss) 939 400 1,352 619  
Total Gain (Loss) $ 508 $ 232 $ 443 $ 271