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FAIR VALUE - HIERARCHY (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other $ 1,818 $ 1,840
Total assets at fair value 22,433 140,790
Total liabilities at fair value 58,702 47,217
Physical commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 4,820 7,796
Liabilities 35,622 32,517
Financial commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 15,496 18,779
Liabilities 23,001 14,593
Foreign currency contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 258 84
Liabilities 79 107
Quoted Prices in Active Markets for Identical Assets, (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other 1,818 1,840
Total assets at fair value 17,355 132,410
Total liabilities at fair value 22,732 14,593
Quoted Prices in Active Markets for Identical Assets, (Level 1) | Physical commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities 0 0
Quoted Prices in Active Markets for Identical Assets, (Level 1) | Financial commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 15,496 18,279
Liabilities 22,732 14,593
Quoted Prices in Active Markets for Identical Assets, (Level 1) | Foreign currency contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities 0 0
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other 0 0
Total assets at fair value 5,078 8,380
Total liabilities at fair value 35,970 32,624
Significant Other Observable Inputs (Level 2) | Physical commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 4,820 7,796
Liabilities 35,622 32,517
Significant Other Observable Inputs (Level 2) | Financial commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 500
Liabilities 269 0
Significant Other Observable Inputs (Level 2) | Foreign currency contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 258 84
Liabilities 79 107
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other 0 0
Total assets at fair value 0 0
Total liabilities at fair value 0 0
Significant Unobservable Inputs (Level 3) | Physical commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities 0 0
Significant Unobservable Inputs (Level 3) | Financial commodity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities 0 0
Significant Unobservable Inputs (Level 3) | Foreign currency contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities 0 0
Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 41 112,291
Money market funds | Quoted Prices in Active Markets for Identical Assets, (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 41 112,291
Money market funds | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Money market funds | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 0 $ 0