Pension Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Sep. 30, 2021
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 707	$ 876	$ 1,414	$ 1,953
Interest cost	3,202	3,255	6,403	6,316
Expected return on plan assets	(5,894)	(5,791)	(11,789)	(11,698)
Amortization of prior service cost (credit)	134	140	268	280
Amortization of actuarial loss	436	727	871	1,797
Net periodic benefit cost (credit)	(1,415)	(793)	(2,833)	(1,352)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	477	699	955	1,398
Interest cost	843	839	1,685	1,678
Expected return on plan assets	(1,126)	(1,039)	(2,251)	(2,078)
Amortization of prior service cost (credit)		(108)		(216)
Amortization of actuarial loss	(334)	55	(668)	110
Net periodic benefit cost (credit)	$ (140)	$ 446	$ (279)	$ 892