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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Apr. 02, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | Changes in goodwill presented by reportable segments were as follows:
| Software Products Segment |  | Services Segment |  | Total
| (in thousands)
Balance, October 1, 2015 | $ | 1,016,413 |  |  | $ | 52,628 |  |  | $ | 1,069,041 |
Acquisition of Vuforia | 23,316 |  |  | — |  |  | 23,316 |
Acquisition of Kepware | 77,081 |  |  | — |  |  | 77,081 |
Foreign currency translation adjustments | 3,305 |  |  | 29 |  |  | 3,334 |
Balance, April 2, 2016 | $ | 1,120,115 |  |  | $ | 52,657 |  |  | $ | 1,172,772 |
Goodwill and Acquired Intangible Assets | Goodwill and acquired intangible assets consisted of the following:
| April 2, 2016 |  | September 30, 2015
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
| (in thousands)
Goodwill (not amortized) |  |  |  |  | $ | 1,172,772 |  |  |  |  |  |  | $ | 1,069,041 |
Intangible assets with finite lives (amortized) (1): |  |  |  |  |  |  |  |  |  |  |
Purchased software | $ | 354,482 |  |  | $ | 187,446 |  |  | $ | 167,036 |  |  | $ | 284,257 |  |  | $ | 174,887 |  |  | $ | 109,370 |
Capitalized software | 22,877 |  |  | 22,877 |  |  | — |  |  | 22,877 |  |  | 22,877 |  |  | — |
Customer lists and relationships | 356,883 |  |  | 191,439 |  |  | 165,444 |  |  | 349,938 |  |  | 174,017 |  |  | 175,921 |
Trademarks and trade names | 19,128 |  |  | 13,087 |  |  | 6,041 |  |  | 18,534 |  |  | 12,759 |  |  | 5,775 |
Other | 3,974 |  |  | 3,851 |  |  | 123 |  |  | 3,946 |  |  | 3,711 |  |  | 235 |
| $ | 757,344 |  |  | $ | 418,700 |  |  | $ | 338,644 |  |  | $ | 679,552 |  |  | $ | 388,251 |  |  | $ | 291,301 |
Total goodwill and acquired intangible assets |  |  |  |  | $ | 1,511,416 |  |  |  |  |  |  | $ | 1,360,342 |
(1) The weighted average useful lives of purchased software, customer lists and relationships, trademarks and trade names and other intangible assets with a remaining net book value are 7 years, 10 years, 9 years, and 3 years, respectively.
Amortization of Intangible Assets | The aggregate amortization expense for intangible assets with finite lives was classified in our Consolidated Statements of Operations as follows:
| Three months ended |  | Six months ended |
| April 2, 2016 |  | April 4, 2015 |  | April 2, 2016 |  | April 4, 2015 |
| (in thousands)
Amortization of acquired intangible assets | $ | 8,396 |  |  | $ | 9,173 |  |  | $ | 16,746 |  |  | $ | 18,586 |  |
Cost of software revenue | 6,725 |  |  | 4,714 |  |  | 11,852 |  |  | 9,481 |  |
Total amortization expense | $ | 15,121 |  |  | $ | 13,887 |  |  | $ | 28,598 |  |  | $ | 28,067 |  |

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