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Goodwill and Acquired Intangible Assets (Schedule Of Movements of Goodwill by Reportable Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | $ 1,169,660 |  |  | $ 1,069,041 | $ 1,169,813 | $ 1,069,041
Goodwill acquired |  |  |  |  | 2,847 |
Foreign currency translation and other adjustments | 153 | $ 222 |  |  | 10,112 |
Balance, end of period | 1,169,813 | 1,169,660 |  |  | 1,182,772 | 1,169,813
Software Products [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 1,117,038 |  |  | 1,016,413 |  | 1,016,413
Foreign currency translation and other adjustments |  | 228 |  |  |  |
Balance, end of period |  | 1,117,038 |  |  |  |
Services [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 52,622 |  |  | 52,628 |  | 52,628
Foreign currency translation and other adjustments |  | (6) |  |  |  |
Balance, end of period |  | 52,622 |  |  |  |
Solutions Group [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 1,050,013 |  |  |  | 1,050,150 |
Goodwill acquired |  |  |  |  | 2,847 |
Foreign currency translation and other adjustments | 137 |  |  |  | 9,077 |
Balance, end of period | 1,050,150 | 1,050,013 |  |  | 1,062,074 | 1,050,150
IoT Group [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 90,053 |  |  |  | 90,065 |
Goodwill acquired |  |  |  |  | 0 |
Foreign currency translation and other adjustments | 12 |  |  |  | 778 |
Balance, end of period | 90,065 | 90,053 |  |  | 90,843 | 90,065
Professional Services [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 29,594 |  |  |  | 29,598 |
Goodwill acquired |  |  |  |  | 0 |
Foreign currency translation and other adjustments | 4 |  |  |  | 257 |
Balance, end of period | $ 29,598 | $ 29,594 |  |  | $ 29,855 | 29,598
Vuforia Acquisition [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired |  |  |  | 23,316 |  |
Vuforia Acquisition [Member] | Software Products [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired |  |  |  | 23,316 |  |
Vuforia Acquisition [Member] | Services [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired |  |  |  | $ 0 |  |
Kepware [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired |  |  | $ 77,081 |  |  | $ 77,081
Kepware [Member] | Software Products [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired |  |  | 77,081 |  |  |
Kepware [Member] | Services [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired |  |  | $ 0 |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -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 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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