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Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (Contingent Consideration Liabilities) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |
Contingent consideration, beginning balance |  | $ 19,570 | $ 13,000
Contingent consideration at acquisition |  |  | 16,900
Change in fair value of contingent consideration |  | 930 | 1,170
Payment of contingent consideration |  | (12,100) | (11,500)
Contingent consideration, ending balance |  | 8,400 | 19,570
ThingWorx [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Contingent consideration, beginning balance |  | 0 | 9,000
Contingent consideration at acquisition |  |  | 0
Change in fair value of contingent consideration |  | 0 | 0
Payment of contingent consideration | $ (9,000) | 0 | (9,000)
Contingent consideration, ending balance |  | 0 | 0
ColdLight [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Contingent consideration, beginning balance |  | 2,500 | 4,000
Contingent consideration at acquisition |  |  | 0
Change in fair value of contingent consideration |  | 0 | 1,000
Payment of contingent consideration |  | (2,500) | (2,500)
Contingent consideration, ending balance |  | 0 | 2,500
Kepware [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Contingent consideration, beginning balance |  | 17,070 | 0
Contingent consideration at acquisition |  |  | 16,900
Change in fair value of contingent consideration |  | 930 | 170
Payment of contingent consideration |  | (9,600) | 0
Contingent consideration, ending balance |  | $ 8,400 | $ 17,070

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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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