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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 20, 2020 | Oct. 03, 2021 USD ($) | Sep. 27, 2020 USD ($) | Oct. 03, 2021 USD ($) | Sep. 27, 2020 USD ($) | Jan. 03, 2021 USD ($) Supplier
Accounting Policies [Line Items] |  |  |  |  |  |
Reporting period, minimum |  |  |  | 364 days |  |
Reporting period, maximum |  |  |  | 371 days |  |
Concentration risk, suppliers | Supplier |  |  |  |  |  | 680
Concentration risk, largest supplier | Supplier |  |  |  |  |  | 20
Suppliers accounted for total purchases |  |  |  |  |  | 36.40%
Vendor represented greater than of total purchases | Supplier |  |  |  |  |  | 1
Number of performance obligation |  |  |  | one |  |
Stored value card redemption revenue recognized |  | $ 1,300,000 | $ 1,300,000 | $ 4,500,000 | $ 3,900,000 |
Outstanding stored value card liabilities |  | 6,900,000 |  | $ 6,900,000 |  | $ 7,500,000
Stored value cards redeemed period |  |  |  | 2 years |  |
Impairment charges |  |  |  | $ 0 | 0 |
Merchandise [Member] | Accounting Standards Update 2014-09 | ASC 606 [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Estimated right of return related to estimated sales returns |  |  |  | 800,000 |  | 1,200,000
Allowance for sales returns reserve |  | 1,600,000 |  | 1,600,000 |  | $ 2,400,000
Stored Value Card Breakage Revenue [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Recognized stored value card breakage revenue |  | 100,000 | $ 100,000 | 200,000 | $ 200,000 |
Nike [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Suppliers accounted for total purchases |  |  |  |  |  | 8.50%
Percentage of vendors represented greater than of total purchases |  |  |  |  |  | 5.00%
Suppliers accounted for total sales |  |  |  |  |  | 7.20%
COVID-19 [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of minimum number of retail store locations closed | 50.00% |  |  |  |  |
Deferred, lease liability |  | $ 200,000 |  | $ 200,000 |  | $ 600,000
COVID-19 [Member] | California [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of stores |  |  |  | 52.00% |  |
First Quarter [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Interim reporting periods |  |  |  | 91 days |  | 91 days
Second Quarter [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Interim reporting periods |  |  |  | 91 days |  | 91 days
Third Quarter [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Interim reporting periods |  |  |  | 91 days |  | 91 days
Fourth Quarter [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Interim reporting periods |  |  |  | 91 days |  | 98 days

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