Pension Plans (Fair Value Of Plan Assets) (Details) - International Plan Assets [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	$ 70,141	$ 70,494
Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	29,754	29,445
Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	2,499	10,675
Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	24,502	16,164
Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	724	3,966
Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	8,413	8,714
Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	4,249	1,530
Level 1 [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	61,728	61,780
Level 1 [Member] | Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	29,754	29,445
Level 1 [Member] | Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	2,499	10,675
Level 1 [Member] | Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	24,502	16,164
Level 1 [Member] | Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	724	3,966
Level 1 [Member] | Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 1 [Member] | Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	4,249	1,530
Level 2 [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	8,413	8,714
Level 2 [Member] | Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 2 [Member] | Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 2 [Member] | Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 2 [Member] | Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 2 [Member] | Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	8,413	8,714
Level 2 [Member] | Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	0	0
Level 3 [Member] | Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	$ 0	$ 0