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Shareholders' Equity - Additional Information (Detail) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 17, 2022 USD ($) | Jan. 21, 2021 USD ($) $ / shares shares | May 05, 2020 USD ($) $ / shares shares | Oct. 31, 2022 USD ($) | Jan. 03, 2023 USD ($) Serie $ / shares shares | Dec. 28, 2021 USD ($) shares | Dec. 29, 2020 USD ($)
Class Of Stock [Line Items] |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | $ 28,907,000 | $ 67,342,000
Payment for consulting agreement for defined services | $ 100,000,000 |  |  |  | $ 195,000 |  |
Payment for possible additional phase | $ 45,000,000 |  |  |  |  |  |
Payment for extension to additional phase |  |  |  | $ 50,000,000 |  |  |
Agreement maturity date |  |  |  |  | Dec. 31, 2022 |  |
Preferred stock, shares authorized | shares |  |  |  |  | 5,000,000 | 5,000,000 |
Series of preferred stock, minimum | Serie |  |  |  |  | 1 |  |
Preferred stock, issued | shares |  |  |  |  | 0 | 0 |
Preferred stock, outstanding | shares |  |  |  |  | 0 | 0 |
Voting rights, per share |  |  |  |  | one |  |
Common stock remaining under the same repurchase plan |  |  |  |  | $ 22,100,000 |  |
Current amount authorized under the share repurchase plan |  |  |  |  | $ 500,000,000 |  |
Number of shares repurchased during the period | shares |  |  |  |  | 91,000 |  |
Repurchased average price per share | $ / shares |  |  |  |  | $ 26.12 |  |
Shares repurchased, value |  |  |  |  | $ 2,385,000 |  | 15,014,000
Retained Earnings [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased, value |  |  |  |  | $ (5,712,000) | $ (42,777,000) | (56,698,000)
Capital Surplus [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  | $ 3,394,000
Private Placement |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Issuance of common stock |  |  | $ 70,000,000 |  |  |  |
Issuance of common stock (in shares) | shares |  |  | 3,500,000 |  |  |  |
Common stock, per share | $ / shares |  |  | $ 20.00 |  |  |  |
Term of warrants |  |  | 5 years |  |  |  |
Number of shares issuable on exercise of warrants | shares |  |  | 875,000 |  |  |  |
Warrants exercise price, per share | $ / shares |  |  | $ 27.00 |  |  |  |
Stock transaction, Description |  |  | On May 5, 2020, we completed the sale of $70 million of our common stock to certain funds and accounts advised by T. Rowe Price Associates, Inc., acting as investment adviser, and to Act III Holdings, LLC (“Act III,” and collectively “the investors”). The investors purchased a total of 3,500,000 shares of BJ’s Restaurants common stock for $20.00 per share in a private placement under Section 4(2) of the Securities Act of 1933, as amended. The Company also issued a five year warrant to purchase 875,000 shares of our common stock with an exercise price of $27.00 per share to Act III. The warrant expires on May 4, 2025, five years following the issuance. |  |  |  |
Date on which warrant expires |  |  | May 04, 2025 |  |  |  |
Private Placement | Retained Earnings [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  | 3,500,000 |  |
Proceeds from issuance of common stock, net |  |  |  |  | $ 64,000,000.0 |  |
Private Placement | Capital Surplus [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Net proceeds of warrant |  |  |  |  | $ 3,400,000 |  |
At The Market Offering |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  | 703,399 |  |  |  |  |
Common stock, per share | $ / shares |  | $ 42.65 |  |  |  |  |
Number of shares issuable on exercise of warrants | shares |  | 876,949 |  |  |  |  |
Warrants exercise price, per share | $ / shares |  | $ 26.94 |  |  |  |  |
Proceeds from issuance of common stock, gross |  | $ 30,000,000.0 |  |  |  |  |

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