Quarterly report [Sections 13 or 15(d)]

Investment in Derivative Instruments (Details)

v3.25.2
Investment in Derivative Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) $ 1,876 $ 2,635 $ 5,922 $ 7,858  
Unrealized Gain (Loss) 0 10 0 (184)  
Total Gain (Loss) 1,876 2,645 5,922 7,674  
Net unrealized gain position 9,379   9,379   $ 11,646
Cash Flow Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Unrealized Gain (Loss)     9,400   11,600
Interest Rate Swap | Other Assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, fair value 9,379   9,379   $ 11,646
Cost of revenues - Commodity Swap Contracts          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss)     0 (61)  
Unrealized Gain (Loss)     0 (184)  
Total Gain (Loss)     0 (245)  
Cost of revenues - Commodity Swap Contracts | Commodity swap contracts          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) 0 0      
Unrealized Gain (Loss) 0 10      
Total Gain (Loss) 0 10      
Interest expense, net - Interest Rate Swap Contracts          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss)     5,922 7,919  
Unrealized Gain (Loss)     0 0  
Total Gain (Loss)     $ 5,922 $ 7,919  
Interest expense, net - Interest Rate Swap Contracts | Interest Rate Swap          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Realized Gain (Loss) 1,876 2,635      
Unrealized Gain (Loss) 0 0      
Total Gain (Loss) $ 1,876 $ 2,635