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Restructuring - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 26, 2020 USD ($) | Sep. 26, 2020 USD ($) Employee | Sep. 28, 2019 USD ($) | Dec. 28, 2019 USD ($) | Jun. 27, 2020 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Percentage of reduction in headcount |  | 35.00% |  |  |
Number of majority employee | Employee |  | 11 |  |  |
Expenses | $ 2,251 | $ 13,459 | $ 6,331 |  |
Expenses, after tax | 1,680 | 9,996 | 4,727 |  |
Anticipates recording additional expenses in connection with restructuring | 9,000 | 9,000 |  |  |
Payments for expenses | 4,419 | 8,086 |  | $ 5,077 |
Provisions | 20 | 20 |  | $ 83 |
Restructuring remaining liability | 5,393 | 5,393 |  |  |
Revision in estimates | 22,500 | 22,500 |  |  | $ 14,000
Fiscal 2019 |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Payments for expenses |  | 1,052 |  |  |
Provisions |  | 119 |  |  |
Restructuring liability | 0 | 0 |  |  |
Cost of Revenues |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Expenses | 1,062 | 7,565 | 1,425 |  |
Selling, General and Administrative Expenses |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Expenses | $ 1,189 | $ 5,894 | $ 4,906 |  |

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