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 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) $ 2,604 $ 2,463 $ 5,223 $ 4,399  
Unrealized Gain (Loss) 32 (1,279) (194) (2,286)  
Total Gain (Loss) 2,636 1,184 5,029 2,113  
Net unrealized gain position 21,021   21,021   $ 27,093
Other Assets | Cash Flow Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Unrealized Gain (Loss)     21,000   26,900
Commodity Swap | Prepaid Expenses and Other Current Assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 0   0   204
Commodity Swap | Accrued Expense and Other Current Liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liabilities, fair value (10)   (10)   (20)
Interest Rate Swap | Other Assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 21,031   21,031   $ 26,909
Cost of revenues          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) (42) 456 (61) 1,057  
Unrealized Gain (Loss) 32 (1,279) (194) (2,286)  
Total Gain (Loss) (10) (823) (255) (1,229)  
Interest expense, net          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) 2,646 2,007 5,284 3,342  
Unrealized Gain (Loss) 0 0 0 0  
Total Gain (Loss) $ 2,646 $ 2,007 $ 5,284 $ 3,342