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Goodwill and Acquired Intangible Assets (Schedule Of Movements of Goodwill by Reportable Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Apr. 02, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | $ 1,169,660 |  | $ 1,069,041 | $ 1,069,041 | $ 1,069,041 | $ 1,012,527
Foreign currency translation and other adjustments | 153 |  |  | 222 |  | (28,594)
Balance, end of period | 1,169,813 |  |  |  | 1,169,813 | 1,069,041
Software Products [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 1,117,038 |  | 1,016,413 | 1,016,413 | 1,016,413 | 959,768
Foreign currency translation and other adjustments |  |  |  | 228 |  | (28,463)
Balance, end of period |  |  |  |  |  | 1,016,413
Services [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 52,622 |  | 52,628 | 52,628 | 52,628 | 52,759
Foreign currency translation and other adjustments |  |  |  | $ (6) |  | (131)
Balance, end of period |  |  |  |  |  | 52,628
Solutions Group [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 1,050,013 |  |  |  |  |
Foreign currency translation and other adjustments | 137 |  |  |  |  |
Balance, end of period | 1,050,150 |  |  |  | 1,050,150 |
Technology Platform Group [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 90,053 |  |  |  |  |
Foreign currency translation and other adjustments | 12 |  |  |  |  |
Balance, end of period | 90,065 |  |  |  | 90,065 |
Professional Services [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 29,594 |  |  |  |  |
Foreign currency translation and other adjustments | 4 |  |  |  |  |
Balance, end of period | $ 29,598 |  |  |  | 29,598 |
Acquired entity name: Axeda [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Adjustment of purchase price from escrow |  |  |  |  |  | (180)
Acquired entity name: Axeda [Member] | Software Products [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Adjustment of purchase price from escrow |  |  |  |  |  | (180)
Acquired entity name: Axeda [Member] | Services [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Adjustment of purchase price from escrow |  |  |  |  |  | 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
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 |  |  |
Acquired entity name: Kepware [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired |  | $ 77,081 |  |  | $ 77,081 |
Acquired entity name: Kepware [Member] | Software Products [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired |  | 77,081 |  |  |  |
Acquired entity name: Kepware [Member] | Services [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired |  | $ 0 |  |  |  |

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