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Supplemental Cash Flow Information - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 26, 2017 | Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Business Acquisition [Line Items] |  |  |  |
Unpaid amounts related to purchase of assets |  | $ 600 | $ 4,000 |
Equity interests issued and issuable | $ 465,100 | 0 | 0 | $ 465,082
Fixed assets acquired |  | 1,500 | 18,400 |
Loss on minority equity investment |  | 7,481 | 10,406 | $ 0
Equity Securities | Compute |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Investments |  | 36,500 |  |
Loss on minority equity investment |  | 7,500 | 10,400 |
Compute Business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration on sale of business |  | 36,500 |  |
Developer Funded |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fixed assets acquired |  | $ 300 | $ 12,700 |

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