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Retirement Benefits (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Common shares issued from treasury stock for benefit plans	$ 14,846	$ 14,741	$ 14,846	$ 14,741
Preferred Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Common shares issued from treasury stock for benefit plans
Treasury Stock at Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Common shares issued from treasury stock for benefit plans	$ 5,673	$ 7,584	$ 5,673	$ 7,584
Common shares issued from treasury stock for benefit plans, shares	158	202	158	202

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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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