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Fair Value Measurements (Contingent Consideration Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |
Contingent consideration, beginning balance | $ 8,400 | $ 19,570
Contingent consideration at acquisition | 2,100 |
Change in fair value of contingent consideration |  | 930
Payment of contingent consideration | (8,925) | (12,100)
Contingent consideration, ending balance | 1,575 | 8,400
ColdLight [Member] |  |
Business Acquisition [Line Items] |  |
Contingent consideration, beginning balance | 0 | 2,500
Contingent consideration at acquisition | 0 |
Change in fair value of contingent consideration |  | 0
Payment of contingent consideration | 0 | (2,500)
Contingent consideration, ending balance | 0 | 0
Kepware [Member] |  |
Business Acquisition [Line Items] |  |
Contingent consideration, beginning balance | 8,400 | 17,070
Contingent consideration at acquisition | 0 |
Change in fair value of contingent consideration |  | 930
Payment of contingent consideration | (8,400) | (9,600)
Contingent consideration, ending balance | 0 | 8,400
Other [Member] |  |
Business Acquisition [Line Items] |  |
Contingent consideration, beginning balance | 0 | 0
Contingent consideration at acquisition | 2,100 |
Change in fair value of contingent consideration |  | 0
Payment of contingent consideration | (525) | 0
Contingent consideration, ending balance | $ 1,575 | $ 0

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- Definition Contingent Consideration Liability, Fair Value Disclosure + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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