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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Outstanding Commodity Contracts that Hedge Forecasted Purchases (Details)	12 Months Ended
	Sep. 30, 2021 lb T gal	Sep. 30, 2020 T lb gal
Urea
Derivative [Line Items]
Outstanding commodity contracts, mass | T	94,500	76,500
Resin
Derivative [Line Items]
Outstanding commodity contracts, mass | lb	0	9,100,000
Diesel
Derivative [Line Items]
Outstanding commodity contracts, volume	5,880,000	5,838,000
Heating Oil
Derivative [Line Items]
Outstanding commodity contracts, volume	2,268,000	2,142,000

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Nominal mass used to calculate payments on a derivative instrument.

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Nominal volume used to calculate payments on a derivative instrument.

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