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Retirement Plans (Strategic Allocation of Plan Assets) (Details)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Strategic asset allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%
Actual asset allocations
Actual plan asset allocations	100.00%	100.00%	100.00%
Equity Securities [Member]
Strategic asset allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	30.00%
Actual asset allocations
Actual plan asset allocations	29.00%	21.00%	19.00%
Fixed Income Securities [Member]
Strategic asset allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	70.00%
Fixed Income Funds [Member]
Actual asset allocations
Actual plan asset allocations	70.00%	78.00%	79.00%
Cash and Cash Equivalents [Member]
Strategic asset allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Actual asset allocations
Actual plan asset allocations	1.00%	1.00%	2.00%
Minimum [Member] | Equity Securities [Member]
Strategic asset allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	25.00%
Minimum [Member] | Fixed Income Funds [Member]
Strategic asset allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	65.00%
Minimum [Member] | Cash and Cash Equivalents [Member]
Strategic asset allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Maximum [Member] | Fixed Income Funds [Member]
Strategic asset allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	70.00%
Maximum [Member] | Cash and Cash Equivalents [Member]
Strategic asset allocation
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5.00%

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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