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Employee Benefit Plans (Schedule of Actual and Expected Employer Contributions) (Details)
3 Months Ended
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Fiscal Year-to-Date Contributions $ 0
Remaining Fiscal Year Contributions 900,000
Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Fiscal Year-to-Date Contributions 0
Remaining Fiscal Year Contributions 500,000
Postretirement Medical Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Fiscal Year-to-Date Contributions 0
Remaining Fiscal Year Contributions $ 400,000