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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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