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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