Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (Contingent Consideration Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Contingent consideration, beginning balance	$ 13,000	$ 15,191
Contingent consideration at acquisition	16,900	3,800
Change in fair value of contingent consideration	1,170	3,009
Payment of contingent consideration	(11,500)	(9,000)
Contingent consideration, ending balance	19,570	13,000
Acquired entity name-ThingWorx [Member]
Business Acquisition [Line Items]
Contingent consideration, beginning balance	9,000	15,191
Contingent consideration at acquisition	0	0
Change in fair value of contingent consideration	0	2,809
Payment of contingent consideration	(9,000)	(9,000)
Contingent consideration, ending balance	0	9,000
Acquired entity name: ColdLight [Member]
Business Acquisition [Line Items]
Contingent consideration, beginning balance	4,000	0
Contingent consideration at acquisition	0	3,800
Change in fair value of contingent consideration	1,000	200
Payment of contingent consideration	(2,500)	0
Contingent consideration, ending balance	2,500	4,000
Acquired entity name: Kepware [Member]
Business Acquisition [Line Items]
Contingent consideration, beginning balance	0	0
Contingent consideration at acquisition	16,900	0
Change in fair value of contingent consideration	170	0
Payment of contingent consideration	0	0
Contingent consideration, ending balance	$ 17,070	$ 0