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Defined Benefit Pension Plan - Actuarial Assumptions (Details)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Discount rate to determine net periodic (benefit) cost	1.60%	1.80%
Expected return on plan assets	2.82%	3.00%
Discount rate to determine benefit obligations	2.00%	1.60%
Rate of increases to deferred CPI linked benefits	3.10%	2.50%
Rate of increases to deferred RPI linked benefits	3.60%	3.00%

X

- Definition

Represents the rate of increases to deferred Consumer Price Index (CPI) linked benefits which is an actuarial assumption used to determine the benefit obligations and the net periodic benefit cost.

+ References

No definition available.

+ Details

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- Definition

Represents the rate of increases to deferred Retail Prices Index (RPI) linked benefits which is an actuarial assumption used to determine the benefit obligations and the net periodic benefit cost.

+ References

No definition available.

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- References

No definition available.

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- Definition

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

+ References

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

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=123447040&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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920

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