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Acquisitions (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||||||||||||||||||||||||
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Sep. 30, 2012
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 30, 2013
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Jun. 30, 2014
Atego [Member]
employees
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Sep. 30, 2014
Atego [Member]
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Jun. 30, 2014
ThingWorx, Inc. [Member]
employees
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Sep. 30, 2014
ThingWorx, Inc. [Member]
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Jun. 28, 2014
ThingWorx, Inc. [Member]
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Sep. 30, 2014
ThingWorx [Member]
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Sep. 30, 2013
Servigistics, Enigma and NetIDEAS [Member]
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Sep. 30, 2013
NetIDEAS and Enigma [Member]
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Sep. 30, 2013
Servigistics [Member]
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Sep. 30, 2014
Servigistics [Member]
employees
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Sep. 30, 2013
Servigistics [Member]
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Sep. 30, 2014
2014 Acquisitions [Member]
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Jul. 23, 2014
Axeda [Member]
employees
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Sep. 30, 2014
Axeda [Member]
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Sep. 30, 2014
Purchased Software [Member]
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Sep. 30, 2014
Purchased Software [Member]
Atego [Member]
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Sep. 30, 2014
Purchased Software [Member]
ThingWorx, Inc. [Member]
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Sep. 30, 2014
Purchased Software [Member]
Axeda [Member]
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Sep. 30, 2014
Customer Lists and Relationships [Member]
Atego [Member]
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Sep. 30, 2014
Customer Lists and Relationships [Member]
ThingWorx, Inc. [Member]
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Sep. 30, 2014
Customer Lists and Relationships [Member]
Axeda [Member]
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Sep. 30, 2014
Trademarks And Trade Names [Member]
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Sep. 30, 2014
Trademarks And Trade Names [Member]
Atego [Member]
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Sep. 30, 2014
Trademarks And Trade Names [Member]
ThingWorx, Inc. [Member]
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Sep. 30, 2014
Trademarks And Trade Names [Member]
Axeda [Member]
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Sep. 30, 2014
Other Intangible Assets [Member]
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Sep. 30, 2014
Other Intangible Assets [Member]
Atego [Member]
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Sep. 30, 2014
Other Intangible Assets [Member]
ThingWorx [Member]
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Sep. 30, 2014
Other Intangible Assets [Member]
Axeda [Member]
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Sep. 30, 2014
Segment, Software Products [Member]
Atego [Member]
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Sep. 30, 2014
Segment, Software Products [Member]
ThingWorx [Member]
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Sep. 30, 2013
Segment, Software Products [Member]
Servigistics [Member]
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Sep. 30, 2014
Segment, Software Products [Member]
Axeda [Member]
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Sep. 30, 2014
Services [Member]
Atego [Member]
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Sep. 30, 2014
Services [Member]
ThingWorx [Member]
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Sep. 30, 2013
Services [Member]
Servigistics [Member]
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Sep. 30, 2014
Services [Member]
Axeda [Member]
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Nov. 17, 2014
Subsequent Event [Member]
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Dec. 27, 2013
Line of Credit [Member]
ThingWorx [Member]
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| Revenue from acquisition | $ 9,800,000 | $ 94,900,000 | $ 80,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | 12,000,000 | |||||||||||||||||||||||||||||||||||||||||||
| Deferred Tax Liabilities, Net | 136,196,000 | 120,796,000 | 3,476,000 | 8,934,000 | 38,672,000 | 21,600,000 | 9,145,000 | |||||||||||||||||||||||||||||||||||||
| Acquisition-related cost | 12,700,000 | 9,900,000 | 3,800,000 | |||||||||||||||||||||||||||||||||||||||||
| Number of employees added by acquisition | 400 | |||||||||||||||||||||||||||||||||||||||||||
| Business acquisition, cost of acquired entity, cash paid | 323,525,000 | 245,843,000 | 220,000 | 46,015,000 | 46,106,000 | 111,519,000 | 25,000,000 | 220,818,000 | 165,900,000 | |||||||||||||||||||||||||||||||||||
| Proceeds from Lines of Credit | 1,386,250,000 | 0 | 230,000,000 | 170,000,000 | 35,000,000 | 110,000,000 | ||||||||||||||||||||||||||||||||||||||
| Acquisition of businesses, net cash acquired | 9,575,000 | 3,550,000 | 133,000 | 1,000,000 | 1,400,000 | 9,575,000 | ||||||||||||||||||||||||||||||||||||||
| Business Combination, Contingent Consideration, Liability | 13,048,000 | 13,048,000 | 0 | 13,048,000 | 0 | |||||||||||||||||||||||||||||||||||||||
| Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low | 16,500,000 | |||||||||||||||||||||||||||||||||||||||||||
| Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | 2,143,000 | |||||||||||||||||||||||||||||||||||||||||||
| Business Acquisition, Number of Employees of Acquiree | 110 | 40 | 160 | |||||||||||||||||||||||||||||||||||||||||
| Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 18,000,000 | |||||||||||||||||||||||||||||||||||||||||||
| Goodwill acquired | 27,256,000 | 102,190,000 | 102,190,000 | 14,300,000 | 139,833,000 | 130,443,000 | 27,256,000 | 102,190,000 | 127,033,000 | 126,034,000 | 0 | 0 | 12,800,000 | 4,409,000 | ||||||||||||||||||||||||||||||
| Finite-lived Intangible Assets Acquired | 59,170,000 | 27,750,000 | 32,520,000 | 15,200,000 | 8,200,000 | 21,000,000 | 19,700,000 | 19,400,000 | 8,800,000 | 36,600,000 | 150,000 | 2,300,000 | 2,800,000 | 0 | 420,000 | 70,000 | ||||||||||||||||||||||||||||
| Deferred Tax Liabilities, Intangible Assets | 5,300,000 | |||||||||||||||||||||||||||||||||||||||||||
| Deferred tax assets, change in valuation allowance | (124,500,000) | 32,600,000 | ||||||||||||||||||||||||||||||||||||||||||
| Weighted average useful lives of acquired intangible assets | 9 years | 11 years | 11 years | 9 years | 9 years | 9 years | 11 years | 9 years | 3 years | 12 years | 12 years | 3 years | 3 years | 2 years | ||||||||||||||||||||||||||||||
| Research and Development in Process | $ 500,000 | |||||||||||||||||||||||||||||||||||||||||||