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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Acquired Intangible Assets | Goodwill and acquired intangible assets consisted of the following:
| December 31, 2016 |  | September 30, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
| (in thousands)
Goodwill (not amortized) |  |  |  |  | $ | 1,159,492 |  |  |  |  |  |  | $ | 1,169,813 |
Intangible assets with finite lives (amortized) (1): |  |  |  |  |  |  |  |  |  |  |
Purchased software | $ | 351,032 |  |  | $ | 202,266 |  |  | $ | 148,766 |  |  | $ | 354,595 |  |  | $ | 199,192 |  |  | $ | 155,403 |
Capitalized software | 22,877 |  |  | 22,877 |  |  | — |  |  | 22,877 |  |  | 22,877 |  |  | — |
Customer lists and relationships | 349,593 |  |  | 210,132 |  |  | 139,461 |  |  | 355,698 |  |  | 206,515 |  |  | 149,183 |
Trademarks and trade names | 18,789 |  |  | 13,289 |  |  | 5,500 |  |  | 19,007 |  |  | 13,323 |  |  | 5,684 |
Other | 3,860 |  |  | 3,860 |  |  | — |  |  | 3,955 |  |  | 3,920 |  |  | 35 |
| $ | 746,151 |  |  | $ | 452,424 |  |  | $ | 293,727 |  |  | $ | 756,132 |  |  | $ | 445,827 |  |  | $ | 310,305 |
Total goodwill and acquired intangible assets |  |  |  |  | $ | 1,453,219 |  |  |  |  |  |  | $ | 1,480,118 |
(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 9 years, 10 years, 10 years, and 3 years, respectively.
Schedule of Goodwill | Changes in goodwill presented by reportable segments were as follows:
| Solutions Group |  | IoT Group |  | Professional Services |  | Total
| (in thousands)
Balance, October 1, 2016 | $ | 1,050,150 |  |  | $ | 90,065 |  |  | $ | 29,598 |  |  | $ | 1,169,813 |
Foreign currency translation adjustment | (9,265 | ) |  | (795 | ) |  | (261 | ) |  | (10,321 | )
Balance, December 31, 2016 | $ | 1,040,885 |  |  | $ | 89,270 |  |  | $ | 29,337 |  |  | $ | 1,159,492 |
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
| December 31, 2016 |  | January 2, 2016
| (in thousands)
Amortization of acquired intangible assets | $ | 8,067 |  |  | $ | 8,350 |
Cost of software revenue | 6,388 |  |  | 5,127 |
Total amortization expense | $ | 14,455 |  |  | $ | 13,477 |

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