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Pension Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 2,000 | $ 2,000 | $ 46,700
Pension settlement loss |  | 0 | 0 | 66,332
Actuarial loss expected to be recognized in the following year |  | 2,100 |  |
Actual return on plan assets gain (loss) |  | $ 6,300 | 1,700 | 1,900
Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plans, vesting period |  | 1 year |  |
Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plans, vesting period |  | 5 years |  |
Scenario, Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic pension cost | $ 800 |  |  |
Domestic Plan [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  |  | 25,500
Pension settlement loss |  | $ 0 | 0 | 66,332
Net periodic pension cost |  | 0 | 0 | 72,136
Foreign Plan [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | 2,036 | 1,978 |
Pension settlement loss |  | $ 0 | 0 | 0
Long-term rate of return |  | 5.42% |  |
Net periodic pension cost |  | $ 2,564 | $ 1,955 | $ 1,741
Foreign Plan [Member] | Pension Plan [Member] | Germany [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current asset allocation target for equity securities |  | 60.00% |  |
Current asset allocation target for fixed income securities |  | 40.00% |  |
Foreign Plan [Member] | Pension Plan [Member] | Other International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current asset allocation target for fixed income securities |  | 100.00% |  |

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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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