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Intangible Assets - Summary of Activity in Intangible Assets and Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Goodwill and Intangible Assets [Roll Forward] |  |  |
Beginning balance | $ 773,307 | $ 811,703 |
Fair value adjustment |  | 0 |
Currency translation adjustments | 270 | 889 |
Impairments of intangible assets | (344,625) |  |
Ending balance | 428,952 | 773,307 | $ 811,703
In-process research and development |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |
Impairments of intangible assets |  |  | (4,400)
Trade name, indefinite lived |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |
Beginning balance | 3,400 | 3,400 |
Fair value adjustment |  | 0 |
Currency translation adjustments | 0 | 0 |
Impairments of intangible assets | 0 |  |
Ending balance | 3,400 | 3,400 | 3,400
Total Goodwill |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |
Beginning balance | 314,076 | 313,765 |
Fair value adjustment |  | 2,790 |
Currency translation adjustments | 651 | 81 |
Impairments of intangible assets | 0 |  |
Ending balance | 314,727 | 314,076 | 313,765
Acquired technology |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |
Beginning balance | 251,673 | 251,655 |
Fair value adjustment |  | 0 |
Currency translation adjustments | 270 | 18 |
Impairments of intangible assets | (72,261) |  |
Ending balance | 179,682 | 251,673 | 251,655
Customer relationships |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |
Beginning balance | 518,234 | 556,648 |
Fair value adjustment |  | 0 |
Currency translation adjustments | 0 | 871 |
Impairments of intangible assets | (272,364) |  |
Ending balance | $ 245,870 | 518,234 | $ 556,648
LR4 | Disposal Group, Not Discontinued Operations |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |
Increase (decrease) in intangible assets |  | (39,285) |
Increase (decrease) in goodwill |  | (2,560) |
LR4 | Disposal Group, Not Discontinued Operations | Trade name, indefinite lived |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |
Increase (decrease) to indefinite lived intangible assets |  | 0 |
LR4 | Disposal Group, Not Discontinued Operations | Acquired technology |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |
Increase (decrease) in finite lived intangible assets |  | 0 |
LR4 | Disposal Group, Not Discontinued Operations | Customer relationships |  |  |
Goodwill and Intangible Assets [Roll Forward] |  |  |
Increase (decrease) in finite lived intangible assets |  | $ (39,285) |

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