FAIR VALUE - HIERARCHY (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Assets
Other	$ 1,815	$ 1,840
Total assets at fair value	40,510	140,790
Liabilities
Total liabilities at fair value	100,642	47,217
Money market funds
Assets
Derivative assets	41	112,291
Physical commodity contracts
Assets
Derivative assets	3,187	7,796
Liabilities
Derivative liabilities	37,845	32,517
Financial commodity contracts
Assets
Derivative assets	35,340	18,779
Liabilities
Derivative liabilities	62,794	14,593
Foreign currency contracts
Assets
Derivative assets	127	84
Liabilities
Derivative liabilities	3	107
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Other	1,815	1,840
Total assets at fair value	37,196	132,410
Liabilities
Total liabilities at fair value	62,188	14,593
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Assets
Derivative assets	41	112,291
Quoted Prices in Active Markets for Identical Assets (Level 1) | Physical commodity contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Financial commodity contracts
Assets
Derivative assets	35,340	18,279
Liabilities
Derivative liabilities	62,188	14,593
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2)
Assets
Other	0	0
Total assets at fair value	3,314	8,380
Liabilities
Total liabilities at fair value	38,454	32,624
Significant Other Observable Inputs (Level 2) | Money market funds
Assets
Derivative assets	0	0
Significant Other Observable Inputs (Level 2) | Physical commodity contracts
Assets
Derivative assets	3,187	7,796
Liabilities
Derivative liabilities	37,845	32,517
Significant Other Observable Inputs (Level 2) | Financial commodity contracts
Assets
Derivative assets	0	500
Liabilities
Derivative liabilities	606	0
Significant Other Observable Inputs (Level 2) | Foreign currency contracts
Assets
Derivative assets	127	84
Liabilities
Derivative liabilities	3	107
Significant Unobservable Inputs (Level 3)
Assets
Other	0	0
Total assets at fair value	0	0
Liabilities
Total liabilities at fair value	0	0
Significant Unobservable Inputs (Level 3) | Money market funds
Assets
Derivative assets	0	0
Significant Unobservable Inputs (Level 3) | Physical commodity contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Significant Unobservable Inputs (Level 3) | Financial commodity contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Significant Unobservable Inputs (Level 3) | Foreign currency contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	$ 0	$ 0