Employee Benefit Plans (Schedule of Actual and Expected Employer Contributions) (Details)	6 Months Ended
	Mar. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Fiscal Year-to-Date Contributions	$ 800,000
Remaining Fiscal Year Contributions	400,000
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fiscal Year-to-Date Contributions	400,000
Remaining Fiscal Year Contributions	400,000
Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fiscal Year-to-Date Contributions	400,000
Remaining Fiscal Year Contributions	$ 0