Retirement and Other Benefit Plans - Schedule Of Weighted-Average Assumptions Used To Determine The Net Periodic Benefit Cost For Pension Plans (Details)	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Net Periodic Benefit Cost
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Discount rate	4.15%	3.65%	3.25%
Rate of increase in compensation levels
Expected long-term rate of return on assets	6.00%	6.00%	6.25%
Net Periodic Benefit Obligations
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Discount rate	3.05%	4.15%
Rate of increase in compensation levels

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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