Employee Benefit Plans (Schedule of Actual and Expected Employer Contributions) (Details)	9 Months Ended
	Jun. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Fiscal Year-to-Date Contributions	$ 1,200,000
Remaining Fiscal Year Contributions	0
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fiscal Year-to-Date Contributions	800,000
Remaining Fiscal Year Contributions	0
Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fiscal Year-to-Date Contributions	400,000
Remaining Fiscal Year Contributions	$ 0