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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.

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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