The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Nominal energy measure used to calculate payments on a derivative instrument.

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The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of interest expense classified as operating.

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Maximum period of hedging exposure to variability in future cash flow for forecasted transaction of cash flow hedge, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes forecasted transaction for payment of variable interest on existing financial instrument.

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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) MMBTU in Millions, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) MMBTU	Jun. 30, 2025 USD ($)	Sep. 30, 2025 MMBTU
Derivatives, Fair Value [Line Items]
Net gains to be reclassified from accumulated other comprehensive loss to earnings during the next 12 months			$ 1.1
Commodity Contract
Derivatives, Fair Value [Line Items]
Notional amount (in MMBtus) \| MMBTU			1.9		2.6
Commodity Contract \| Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Percent of forecasted usage to be hedged	90.00%		90.00%
Maximum period which the company hedges in advance of forecasted purchase			36 months
Natural Gas Instruments, Net \| Derivatives Designated as Hedging Instruments \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Net cash expense in product cost	$ 1.0	$ 0.8	$ 1.5	$ 1.8