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Pension Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actuarial loss expected to be recognized in the following year |  | $ 2,400 |  |
Actual return on plan assets gain (loss) |  | 1,000 | $ 6,300 | $ 1,700
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 2,500 | 2,000 | 2,000
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 | $ 1,200 |  |  |
Foreign Plan [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term rate of return |  | 5.44% |  |
Net periodic pension cost |  | $ 912 | 2,564 | $ 1,955
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 2,459 | $ 2,036 |
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 Defined Benefit Plan Actual Return On Plan Assets Gain Or Loss + References No definition available. + Details
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- Definition Defined Benefit Plan Target Allocation Percentage Of Assets Fixed Income Securities + References No definition available. + Details
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- Definition Defined Benefit Plans, Vesting Period + References No definition available. + Details
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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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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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