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