Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Number of years of service			2 years
Percentage of annual contribution equal to eligible prior year wages			5.00%
Common shares issued from treasury stock for benefit plans	$ 14,900	$ 14,748	$ 14,900	$ 14,748
Treasury Stock at Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Common shares issued from treasury stock for benefit plans, shares	128,000	124,000	128,000	124,000
Common shares issued from treasury stock for benefit plans			$ 5,358	$ 5,328

- Definition

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.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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- Definition

Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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- Definition

Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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- Definition

Defined Contribution Plan Annual Contributions Years Of Service

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