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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 28, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes to the carrying amount of goodwill are as follows (in millions):
| As of
| September 28, 2018 |  | September 29, 2017
Goodwill at beginning of the period | $ | 883.0 |  |  | $ | 873.3 |
Goodwill recognized through business combinations (Note 3) | 306.8 |  |  | 9.7 |
Goodwill impairment | — |  |  | — |
Goodwill at the end of the period | $ | 1,189.8 |  |  | $ | 883.0 |
Schedule Of Intangible Assets Excluding Goodwill | Intangible assets consist of the following (in millions):
|  | As of |  | As of
| Weighted average amortization period (years) | September 28, 2018 |  | September 29, 2017
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | 3.4 | $ | 31.7 |  |  | $ | (13.2 | ) |  | $ | 18.5 |  |  | $ | 29.7 |  |  | $ | (14.6 | ) |  | $ | 15.1 |
Developed technology and other | 5.3 | 89.9 |  |  | (23.5 | ) |  | 66.4 |  |  | 59.9 |  |  | (20.6 | ) |  | 39.3 |
Trademarks | 3.0 | 1.6 |  |  | (0.8 | ) |  | 0.8 |  |  | 1.6 |  |  | (0.3 | ) |  | 1.3 |
Capitalized software | 3.0 | 18.0 |  |  | (6.0 | ) |  | 12.0 |  |  | 12.1 |  |  | — |  |  | 12.1 |
IPR&D |  | 46.0 |  |  | — |  |  | 46.0 |  |  | $ | — |  |  | — |  |  | — |
Total intangible assets |  | $ | 187.2 |  |  | $ | (43.5 | ) |  | $ | 143.7 |  |  | $ | 103.3 |  |  | $ | (35.5 | ) |  | $ | 67.8 |
Schedule of Expected Amortization Expense | Annual amortization expense for the next five fiscal years related to intangible assets is expected to be as follows (in millions):
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter
Amortization expense, cost of goods sold | $ | 24.8 |  |  | $ | 22.5 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 1.9 |
Amortization expense, operating expense | 22.6 |  |  | 11.8 |  |  | 9.0 |  |  | 1.0 |  |  | 1.0 |  |  | 2.8 |
Total amortization expense | $ | 47.4 |  |  | $ | 34.3 |  |  | $ | 9.1 |  |  | $ | 1.1 |  |  | $ | 1.1 |  |  | $ | 4.7 |

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