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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | The changes to the carrying amount of goodwill are as follows (in millions):
| As of
| September 30, 2016 |  | October 2, 2015
Goodwill at beginning of the period | $ | 856.7 |  |  | $ | 851.0 |
Goodwill recognized through business combinations (Note 3) | 16.6 |  |  | 3.3 |
Goodwill adjustments | — |  |  | 2.4 |
Impairments | — |  |  | — |
Goodwill at the end of the period | $ | 873.3 |  |  | $ | 856.7 |
Schedule Of Intangible Assets Excluding Goodwill | Intangible assets consist of the following (in millions):
|  | As of |  | As of
| Weighted average amortization period remaining (years) | September 30, 2016 |  | October 2, 2015
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | 4.2 | $ | 78.5 |  |  | $ | (57.7 | ) |  | $ | 20.8 |  |  | $ | 57.2 |  |  | $ | (48.7 | ) |  | $ | 8.5 |
Developed technology and other | 5.8 | 133.8 |  |  | (89.2 | ) |  | 44.6 |  |  | 99.7 |  |  | (64.8 | ) |  | 34.9 |
Trademarks | Indefinite | 1.6 |  |  | — |  |  | 1.6 |  |  | 1.6 |  |  | — |  |  | 1.6 |
Total intangible assets |  | $ | 213.9 |  |  | $ | (146.9 | ) |  | $ | 67.0 |  |  | $ | 158.5 |  |  | $ | (113.5 | ) |  | $ | 45.0 |
Schedule of Expected Amortization Expense | Annual amortization expense for the next five years related to intangible assets is expected to be as follows (in millions):
| 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | Thereafter
Amortization expense | $ | 23.6 |  |  | $ | 11.0 |  |  | $ | 9.3 |  |  | $ | 7.4 |  |  | $ | 5.3 |  |  | $ | 8.8 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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