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Commitments and Contingencies - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 21, 2020 USD ($) | Apr. 04, 2021 USD ($) | Jun. 28, 2020 USD ($) Store | Oct. 03, 2021 USD ($) | Sep. 27, 2020 USD ($) | Jan. 03, 2021 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Received cash condemnation settlement from Orange County Transport Authority pre-tax gain amount |  |  |  |  | $ 2,500 |
Cash condemnation settlement from Orange Country Transport Authority | $ 2,500 |  |  |  |  |
Loss on property and equipment |  |  |  |  | $ 237 |
Number of stores destroyed in civil unrest | Store |  |  | 7 |  |  |
Loss contingency, total loss |  |  | $ 600 |  |  |
Deduction on settlement |  | $ 300 |  |  |  |
Proceeds from cash insurance recovery total, net of insurance deductible |  | 1,300 |  |  |  |
Proceeds from insurance recovery |  |  |  | $ 1,083 |  |
Proceeds from insurance recovery - property and equipment |  | 200 |  | 249 |  |
Gain on recovery of insurance proceeds - lost profit margin and business interruption |  | 500 |  | 460 |  |
Gain on recovery of insurance proceeds - property and equipment |  | 200 |  | $ 249 |  |
Lost Inventory and Profit Margin [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Proceeds from insurance recovery |  | 1,000 |  |  |  |
Business Interruption [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Proceeds from insurance recovery |  | $ 100 |  |  |  |
Other Income [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Received cash condemnation settlement from Orange County Transport Authority pre-tax gain amount |  |  | 2,500 |  |  |
Loss on property and equipment |  |  | $ 200 |  |  |
Selling and Administrative Expenses [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Attorneys' fees related to fees settlement |  |  |  |  |  | $ 100

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