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Restructuring and Asset Impairment - Schedule of Restructuring and Asset Impairment, Net (Detail) - USD ($) $ in Thousands | 4 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 24, 2021 | Apr. 18, 2020 | Oct. 03, 2020 | Oct. 05, 2019
Restructuring Cost And Reserve [Line Items] |  |  |  |
Asset impairment charges | $ 756 | $ 6,733 |  |
Gain on sales of assets related to closed facilities |  |  | $ (182) | $ 3,911
Provision for severance | 84 | 2,198 |  |
Other costs associated with site closures | 335 | 1,003 |  |
Changes in estimates | (59) | 68 |  |
Restructuring and asset impairment | (161) | 10,237 |  |
Business Restructuring Reserves [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Provision for closing charges | 583 |  |  |
Business Restructuring Reserves [Member] | Lease and Ancillary Costs [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Provision for closing charges | 583 | 325 |  |
Facility Closing [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Gain on sales of assets related to closed facilities | $ (1,860) | $ (90) |  |

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