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Identifiable Intangible Assets | 12 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Identifiable Intangible Assets | Intangible Assets Direct internal and external costs to develop software used by Technologies' customers are capitalized. Capitalized costs are amortized over the 6-year estimated useful life of the software, beginning when the software is complete and ready for sale. At September 30, 2017, the remaining weighted-average amortization period for external-use software was 3.7 years. Amortization expense related to such software assets was $2.4 million, $1.9 million and $1.6 million for 2017, 2016 and 2015, respectively. Amortization expense for each of the next five years is scheduled to be $3.9 million in 2018, $3.6 million in 2019, $3.3 million in 2020, $2.6 million in 2021 and $2.1 million in 2022. At September 30, 2017, the remaining weighted-average amortization period for the business combination-related finite-lived intangible assets was 6.8 years. Amortization expense related to these assets was $19.7 million, $19.3 million and $24.3 million for 2017, 2016 and 2015, respectively. Amortization expense for each of the next five years is scheduled to be $20.0 million in 2018, $19.8 million in 2019, $19.8 million in 2020, $19.8 million in 2021 and $19.7 million in 2022. Intangible assets are presented below.
| September 30,
| 2017 |  | 2016
| (in millions)
Capitalized external-use software: |  |  |
Cost | $ | 28.4 |  |  | $ | 20.9 |
Accumulated amortization | (11.3 | ) |  | (8.9 | )
Net book value | 17.1 |  |  | 12.0 |
Business combination-related: |  |  |
Cost: |  |  |
Finite-lived intangible assets: |  |  |
Technology | 76.7 |  |  | 76.8 |
Customer relationships and other | 359.2 |  |  | 350.5 |
Indefinite-lived intangible assets: |  |  |
Trade names and trademarks | 266.8 |  |  | 263.6 |
Goodwill | 12.9 |  |  | 5.4 |
| 715.6 |  |  | 696.3 |
Accumulated amortization: |  |  |
Technology | (72.2 | ) |  | (71.5 | )
Customer relationships and other | (221.2 | ) |  | (202.2 | )
| (293.4 | ) |  | (273.7 | )
Net book value | 422.2 |  |  | 422.6 |
Total intangible assets net book value | $ | 439.3 |  |  | $ | 434.6 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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