XML 91 R71.htm IDEA: XBRL DOCUMENT v3.21.2
Financial Instruments (Narrative) (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2021
USD ($)
counterparty
bbl
MMcf
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]        
Foreign Currency Forward Contract Hedge Duration 9 years      
Pre-tax Net hedging gains (losses) reclassified within twelve months $ (464,500)      
After tax Net hedging gains (losses) reclassified within twelve months (339,100)      
Fair market value of derivative liability with a credit-risk related contingency 504,600      
Hedging collateral deposits 88,610 $ 0 $ 6,832 $ 3,441
Net Hedging Gains (Losses) in Accumulated Other Comprehensive Income (Loss) (616,400)      
After tax net hedging gains (losses) in accumulated other comprehensive income (Loss) (450,000)      
Foreign Currency Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Notional Amount $ 60,700      
Over the Counter Swaps, No Cost Collars and Foreign Currency Forward Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Number of counterparties in which the company holds over-the-counter swap positions | counterparty 17      
Hedging collateral deposits $ 88,600      
Over the Counter Swaps, No Cost Collars and Foreign Currency Forward Contracts [Member] | Credit Risk Related Contingency Feature [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Number of counterparties with a common credit-risk related contingency | counterparty 15      
Cash Flow Hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedge Duration 5 years      
Cash Flow Hedges [Member] | Natural Gas MMCf [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Nonmonetary notional amount of price risk cash flow hedge derivatives, natural gas | MMcf 419,700      
Cash Flow Hedges [Member] | Crude Oil Bbls [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Nonmonetary notional amount of price risk cash flow hedge derivative, crude oil | bbl 2,016,000