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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 29, 2017
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 29, 2017 |  | September 30, 2016
Goodwill at beginning of the period | $ | 873.3 |  |  | $ | 856.7 |
Goodwill recognized through business combinations (Note 3) | 9.7 |  |  | 16.6 |
Goodwill adjustments | — |  |  | — |
Goodwill impairment | — |  |  | — |
Goodwill at the end of the period | $ | 883.0 |  |  | $ | 873.3 |
Schedule Of Intangible Assets Excluding Goodwill | Intangible assets consist of the following (in millions):
|  | As of |  | As of
| Weighted average amortization period (years) | September 29, 2017 |  | September 30, 2016
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | 5.0 | $ | 78.5 |  |  | $ | (63.4 | ) |  | $ | 15.1 |  |  | $ | 78.5 |  |  | $ | (57.7 | ) |  | $ | 20.8 |
Developed technology and other | 5.0 | 150.2 |  |  | (110.9 | ) |  | 39.3 |  |  | 133.8 |  |  | (89.2 | ) |  | 44.6 |
Trademarks | 3.0 | 1.6 |  |  | (0.3 | ) |  | 1.3 |  |  | 1.6 |  |  | — |  |  | 1.6 |
Internally developed software | 3.0 | 12.1 |  |  | — |  |  | 12.1 |  |  | — |  |  | — |  |  | — |
Total intangible assets |  | $ | 242.4 |  |  | $ | (174.6 | ) |  | $ | 67.8 |  |  | $ | 213.9 |  |  | $ | (146.9 | ) |  | $ | 67.0 |
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):
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter
Amortization expense | $ | 19.8 |  |  | $ | 18.1 |  |  | $ | 15.4 |  |  | $ | 8.5 |  |  | $ | 0.5 |  |  | $ | 5.5 |

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