Pension Plans (Fair Value Of Plan Assets) (Details) - International Plan Assets [Member] - USD ($) $ in Thousands		Sep. 30, 2017	Sep. 30, 2016
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		$ 70,494	$ 61,935
Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		29,445	8,518
Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		10,675	10,218
Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		16,164	30,615
Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		3,966	2,709
Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	[1]	8,714	9,578
Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		1,530	297
Level 1 [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		61,780	52,357
Level 1 [Member] | Government [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		29,445	8,518
Level 1 [Member] | Europe Corporate Investment Grade [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		10,675	10,218
Level 1 [Member] | Europe Large Capitalization Stocks [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		16,164	30,615
Level 1 [Member] | Commodity Option [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		3,966	2,709
Level 1 [Member] | Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	[1]	0	0
Level 1 [Member] | Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		1,530	297
Level 2 [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		8,714	9,578
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	[1]	8,714	9,578
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
Level 3 [Member] | Insurance Company Funds [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets	[1]	0	0
Level 3 [Member] | Cash [Member]
Fair Value of Plan Assets [Line Items]
Fair value of plan assets		$ 0	$ 0

[1] These investments are comprised primarily of funds invested with an insurance company in Japan with a guaranteed rate of return. The insurance company invests these assets primarily in government and corporate bonds.