Pension Plans (Fair Value Of Plan Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	$ 69,879	$ 70,141
Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	26,996	29,754
Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	4,816	2,499
Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	22,648	24,502
Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	1,086	724
Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	8,494	8,413
Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	5,839	4,249
Level 1
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	61,385	61,728
Level 1 | Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	26,996	29,754
Level 1 | Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	4,816	2,499
Level 1 | Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	22,648	24,502
Level 1 | Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	1,086	724
Level 1 | Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 1 | Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	5,839	4,249
Level 2
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	8,494	8,413
Level 2 | Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 2 | Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 2 | Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 2 | Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 2 | Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	8,494	8,413
Level 2 | Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 | Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 | Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 | Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 | Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 | Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 | Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	$ 0	$ 0