Fair Value Measurements - Summary of Fair Values of Outstanding Natural Gas Derivatives (Parenthetical) (Details) - Commodity Contract [Member] - Accounts Receivable [Member] - USD ($)

Jun. 30, 2026

Sep. 30, 2025

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Commodity derivative assets

^[1]

$ 0

$ 1,000,000

Maximum [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Commodity derivative assets

$ 1,000,000

[1]	Zero denotes less than $1 million of activity.

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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