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Acquisitions - Schedule of Aggregate Purchase Price Allocated to Tangible and Identifiable Intangible Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 09, 2017 | Jan. 26, 2017 | Jun. 29, 2018 | Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Consideration: |  |  |  |  |  |
Cash paid upon closing, net of cash acquired |  |  |  | $ 375 | $ 1,000 | $ 270,008
Equity interests issued and issuable |  | $ 465,100 |  | 0 | 0 | $ 465,082
Liabilities assumed: |  |  |  |  |  |
Goodwill |  |  |  | $ 314,727 | 314,076 |
Applied Micro Circuits Corporation |  |  |  |  |  |
Consideration: |  |  |  |  |  |
Payments to acquire businesses |  | 287,060 |  |  |  |
Cash paid upon closing, net of cash acquired |  |  |  |  | 230,298 |
Equity interests issued and issuable |  | 453,632 |  |  |  |
Equity consideration for vested in-the-money stock options and unvested restricted stock units |  | 2,143 |  |  |  |
Fair value of the replacement equity awards attributable to pre-acquisition service |  | 9,307 |  |  |  |
Total consideration |  | 695,400 |  |  | 695,380 |
Total consideration paid, less cash acquired |  | $ 752,142 |  |  |  |
Current assets |  |  |  |  | 69,881 |
Intangible assets |  |  |  |  | 412,848 |
Assets held for sale |  |  |  |  | 40,944 |
Other assets |  |  |  |  | 9,800 |
Total assets acquired |  |  |  |  | 533,473 |
Liabilities assumed: |  |  |  |  |  |
Debt |  |  |  |  | 4,444 |
Other liabilities |  |  |  |  | 18,278 |
Total liabilities assumed |  |  |  |  | 22,722 |
Goodwill |  |  |  |  | 184,629 |
Net assets acquired |  |  |  |  | 510,751 |
Equity interest issued (in shares) |  | 9,544,125 |  |  |  |
Share price (in USD per share) |  | $ 47.53 |  |  |  |
Picometrix |  |  |  |  |  |
Consideration: |  |  |  |  |  |
Payments to acquire businesses | $ 33,500 |  | $ 33,500 |  |  |
Total consideration | $ 29,500 |  |  |  |  |
Current assets |  |  | 6,287 |  |  |
Intangible assets |  |  | 19,000 |  |  |
Other assets |  |  | 3,220 |  |  |
Total assets acquired |  |  | 28,507 |  |  |
Liabilities assumed: |  |  |  |  |  |
Current liabilities |  |  | 2,311 |  |  |
Other liabilities |  |  | 465 |  |  |
Total liabilities assumed |  |  | 2,776 |  |  |
Goodwill |  |  | 7,769 |  |  |
Net assets acquired |  |  | $ 25,731 |  |  |
Common Stock | Applied Micro Circuits Corporation |  |  |  |  |  |
Consideration: |  |  |  |  |  |
Equity interests issued and issuable |  |  |  |  | 455,775 |
Employee Stock Options And Restricted Stock | Applied Micro Circuits Corporation |  |  |  |  |  |
Consideration: |  |  |  |  |  |
Equity interests issued and issuable |  | $ 9,300 |  |  | $ 9,307 |

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