Goodwill and Acquired Intangible Assets (Schedule Of Movements of Goodwill by Reportable Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2015	Sep. 30, 2014
Goodwill [Roll Forward]
Balance, beginning of period	$ 1,012,527	$ 769,095
Foreign currency translation and other adjustments	(28,594)	(16,457)
Balance, end of period	1,069,041	1,012,527
Software Products [Member]
Goodwill [Roll Forward]
Balance, beginning of period	959,768	720,548
Foreign currency translation and other adjustments	(28,463)	(16,260)
Balance, end of period	1,016,413	959,768
Services [Member]
Goodwill [Roll Forward]
Balance, beginning of period	52,759	48,547
Foreign currency translation and other adjustments	(131)	(197)
Balance, end of period	52,628	52,759
ThingWorx [Member]
Goodwill [Roll Forward]
Goodwill acquired		102,190
ThingWorx [Member] \| Software Products [Member]
Goodwill [Roll Forward]
Goodwill acquired		102,190
ThingWorx [Member] \| Services [Member]
Goodwill [Roll Forward]
Goodwill acquired		0
Atego [Member]
Goodwill [Roll Forward]
Goodwill acquired		27,256
Atego [Member] \| Software Products [Member]
Goodwill [Roll Forward]
Goodwill acquired		27,256
Atego [Member] \| Services [Member]
Goodwill [Roll Forward]
Goodwill acquired		0
Axeda [Member]
Goodwill [Roll Forward]
Goodwill acquired		130,443
Axeda [Member] \| Software Products [Member]
Goodwill [Roll Forward]
Goodwill acquired		126,034
Axeda [Member] \| Services [Member]
Goodwill [Roll Forward]
Goodwill acquired		$ 4,409
Acquired entity name: Axeda [Member]
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	(180)
Acquired entity name: Axeda [Member] \| Software Products [Member]
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	(180)
Acquired entity name: Axeda [Member] \| Services [Member]
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	0
Acquired entity name: ColdLight [Member]
Goodwill [Roll Forward]
Goodwill acquired	85,288
Acquired entity name: ColdLight [Member] \| Software Products [Member]
Goodwill [Roll Forward]
Goodwill acquired	85,288
Acquired entity name: ColdLight [Member] \| Services [Member]
Goodwill [Roll Forward]
Goodwill acquired	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 25

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-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

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