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6. Derivative Financial Instruments (Details) - Risk Management - Commodity swap contracts - Cash Flow Hedging - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2024
Jan. 31, 2024
Jul. 31, 2022
Derivatives, Fair Value [Line Items]      
Derivative, notional amount $ 0.2 $ 7.6 $ 70.5
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ (0.9)