| Cover | 12 Months Ended |
| Dec. 31, 2022 | |
| Document Information [Line Items] | |
| Document Type | DEF 14A |
| Amendment Flag | false |
| Entity Information [Line Items] | |
| Entity Registrant Name | BJ’S RESTAURANTS, INC. |
| Entity Central Index Key | 0001013488 |
| Pay vs Performance Disclosure - USD ($) | 4 Months Ended | 8 Months Ended | 12 Months Ended | ||
| Dec. 31, 2021 | Aug. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | |
| Pay vs Performance Disclosure [Table] | |||||
| Pay vs Performance [Table Text Block] | Pay Versus Performance In accordance with Item 402(v) of SEC Regulation S-K, non-PEO (“Non-PEO certain aspects of our financial performance. The Compensation Committee does not utilize CAP as the basis for making compensation decisions. For further information concerning our compensation philosophy and how we align executive compensation with our performance, please see our Compensation Discussion & Analysis. The following table summarizes compensation paid to our PEO as set forth in our Summary Compensation Table, compensation actually paid to our PEO, average compensation paid to our Non-PEO Os as Non-PEO Pay versus Performance Table Value of Initial Fixed (4) : In Thousands Fiscal Year (1) Summary (2) Summary (2) Compensation (3) Compensation (3) Average Non-PEO (2) Average Non-PEO (3) Total Peer Group (5) Net Operating (6) 2022 $2,650,029 N/A $1,945,628 N/A $719,955 $396,206 $69.49 $96.84 $4,076 $(5,480 ) 2021 $2,519,663 $3,711,615 $2,579,184 $4,267,251 $856,556 $861,636 $91.02 $121.51 $(3,606 ) $(16,507 ) 2020 N/A $2,420,804 N/A $3,039,372 $696,597 $688,107 $101.40 $126.87 $(57,885 ) $(86,431 ) (1) Mr. Levin succeeded Mr. Trojan as PEO on September 1, 2021. Mr. Trojan served as the PEO for the entirety of fiscal year 2020. Our Non-PEO • FY 2022: Mr. Houdek, Mr. Lynds, Ms. Miller, and Mr. Krakower • FY 2021: Mr. Houdek, Mr. Mayer, Mr. Lynds, and Ms. Miller • FY 2020: Mr. Levin, Mr. Mayer, Mr. Lynds, Mr. Ledwith, and Ms. Miller (2) Amounts reported in these columns represent the total compensation reported in the Summary Compensation Table for the applicable fiscal year in the case of our PEOs, Messrs. Levin and Trojan, and the average of the total compensation reported in the Summary Compensation Table for the applicable fiscal year for our Non-PEO (3) Amounts reported in these columns represent CAP; adjustments were made to the amounts reported in the Summary Compensation Table for the applicable fiscal year. A reconciliation of the adjustments for our PEOs, Messrs. Levin and Trojan, and for the average of the Non-PEO (4) Total Shareholder Return (“TSR”) is cumulative for the measurement periods beginning on December 31, 2019 and ending on the last day in fiscal year 2022, 2021 and 2020, respectively, calculated in accordance with Item 201(e) of Regulation S-K. (5) “Peer Group” represents the S&P 600 Restaurant Group Index, which we have identified as our peer group for purposes of Item 402(v) and which we use for purposes of compliance with Item 201(e) of Regulation S-K. (6) We have determined that operating income is the financial performance measure that, in our assessment, represents the most important performance measure (that is not otherwise required to be disclosed in the table) used to link compensation actually paid to our named executive officers, for the most recently completed fiscal year, to company performance. Reconciliation of Summary Compensation to Compensation Actually Paid Fiscal 2022 Fiscal 2021 Fiscal 2020 Mr. Levin Average Non-PEO Mr. Levin Mr. Trojan Average Non-PEO Mr. Trojan Average Non-PEO Summary Compensation Table Total $2,650,029 $719,955 $2,519,663 $3,711,615 $856,556 $2,420,804 $696,597 Minus Stock Award Value Reported in Summary Compensation Table for the Fiscal Year (1,000,047 ) (145,877 ) (908,372 ) (1,333,370 ) (219,040 ) (1,069,905 ) (230,778 ) Minus Option Award Value Reported in Summary Compensation Table for the Fiscal Year (499,884 ) (72,903 ) (641,625 ) (666,559 ) (85,835 ) (500,260 ) (100,054 ) Plus 1,331,266 177,747 1,408,643 1,997,836 254,557 1,891,623 270,478 (Minus) Plus (461,714 ) (170,290 ) 11,391 29,036 1,686 119,751 15,973 Plus — — — — 2,404 69,864 24,223 (Minus) Plus (76,232 ) (47,447 ) 183,544 511,023 49,705 84,993 8,989 Minus — (66,235 ) — — — — — Plus 2,210 1,256 5,940 17,670 1,603 22,502 2,679 Compensation Actually Paid $1,945,628 $396,206 $2,579,184 $4,267,251 $861,636 $3,039,372 $688,107 | ||||
| Company Selected Measure Name | OperatingLoss | ||||
| Named Executive Officers, Footnote [Text Block] | Mr. Levin succeeded Mr. Trojan as PEO on September 1, 2021. Mr. Trojan served as the PEO for the entirety of fiscal year 2020. Our Non-PEO • FY 2022: Mr. Houdek, Mr. Lynds, Ms. Miller, and Mr. Krakower • FY 2021: Mr. Houdek, Mr. Mayer, Mr. Lynds, and Ms. Miller • FY 2020: Mr. Levin, Mr. Mayer, Mr. Lynds, Mr. Ledwith, and Ms. Miller | ||||
| Peer Group Issuers, Footnote [Text Block] | “Peer Group” represents the S&P 600 Restaurant Group Index, which we have identified as our peer group for purposes of Item 402(v) and which we use for purposes of compliance with Item 201(e) of Regulation S-K. | ||||
| Adjustment To PEO Compensation, Footnote [Text Block] | Fiscal 2022 Fiscal 2021 Fiscal 2020 Mr. Levin Average Non-PEO Mr. Levin Mr. Trojan Average Non-PEO Mr. Trojan Average Non-PEO Summary Compensation Table Total $2,650,029 $719,955 $2,519,663 $3,711,615 $856,556 $2,420,804 $696,597 Minus Stock Award Value Reported in Summary Compensation Table for the Fiscal Year (1,000,047 ) (145,877 ) (908,372 ) (1,333,370 ) (219,040 ) (1,069,905 ) (230,778 ) Minus Option Award Value Reported in Summary Compensation Table for the Fiscal Year (499,884 ) (72,903 ) (641,625 ) (666,559 ) (85,835 ) (500,260 ) (100,054 ) Plus 1,331,266 177,747 1,408,643 1,997,836 254,557 1,891,623 270,478 (Minus) Plus (461,714 ) (170,290 ) 11,391 29,036 1,686 119,751 15,973 Plus — — — — 2,404 69,864 24,223 (Minus) Plus (76,232 ) (47,447 ) 183,544 511,023 49,705 84,993 8,989 Minus — (66,235 ) — — — — — Plus 2,210 1,256 5,940 17,670 1,603 22,502 2,679 Compensation Actually Paid $1,945,628 $396,206 $2,579,184 $4,267,251 $861,636 $3,039,372 $688,107 | ||||
| Non-PEO NEO Average Total Compensation Amount | $ 719,955 | $ 856,556 | $ 696,597 | ||
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 396,206 | 861,636 | 688,107 | ||
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | Fiscal 2022 Fiscal 2021 Fiscal 2020 Mr. Levin Average Non-PEO Mr. Levin Mr. Trojan Average Non-PEO Mr. Trojan Average Non-PEO Summary Compensation Table Total $2,650,029 $719,955 $2,519,663 $3,711,615 $856,556 $2,420,804 $696,597 Minus Stock Award Value Reported in Summary Compensation Table for the Fiscal Year (1,000,047 ) (145,877 ) (908,372 ) (1,333,370 ) (219,040 ) (1,069,905 ) (230,778 ) Minus Option Award Value Reported in Summary Compensation Table for the Fiscal Year (499,884 ) (72,903 ) (641,625 ) (666,559 ) (85,835 ) (500,260 ) (100,054 ) Plus 1,331,266 177,747 1,408,643 1,997,836 254,557 1,891,623 270,478 (Minus) Plus (461,714 ) (170,290 ) 11,391 29,036 1,686 119,751 15,973 Plus — — — — 2,404 69,864 24,223 (Minus) Plus (76,232 ) (47,447 ) 183,544 511,023 49,705 84,993 8,989 Minus — (66,235 ) — — — — — Plus 2,210 1,256 5,940 17,670 1,603 22,502 2,679 Compensation Actually Paid $1,945,628 $396,206 $2,579,184 $4,267,251 $861,636 $3,039,372 $688,107 | ||||
| Compensation Actually Paid vs. Total Shareholder Return [Text Block] | Relationship between CAP and TSR The graph below illustrates the relationship between TSR and our Peer Group TSR as well as the relationship between CAP and TSR for our PEO and average Non-PEO | ||||
| Compensation Actually Paid vs. Net Income [Text Block] | Relationship between CAP and GAAP Net Income The graph below reflects the relationship between our PEO and average Non-PEO | ||||
| Compensation Actually Paid vs. Company Selected Measure [Text Block] | Relationship between CAP and GAAP Operating Loss (our Company-Selected Measure) The graph below reflects the relationship between our PEO and average Non-PEO | ||||
| Total Shareholder Return Vs Peer Group [Text Block] | Relationship between CAP and TSR The graph below illustrates the relationship between TSR and our Peer Group TSR as well as the relationship between CAP and TSR for our PEO and average Non-PEO | ||||
| Tabular List [Table Text Block] | Performance Measures Used to Link Company Performance and CAP The following is a list of performance measures, which in our assessment represent the most important performance measures we use to link compensation actually paid to the Named Executive Officers for fiscal 2022. Each metric below is used for purposes of determining payouts under either our annual incentive program or vesting of our performance stock units. Please see the Compensation Discussion and Analysis for a further description of these metrics and how they are used in our executive compensation program. 1. Operating Income 2. Comparable Restaurant Sales as measured against Black Box 3. Weekly Sales Average | ||||
| Total Shareholder Return Amount | $ 69.49 | 91.02 | 101.4 | ||
| Peer Group Total Shareholder Return Amount | 96.84 | 121.51 | 126.87 | ||
| Net Income (Loss) | $ 4,076,000 | $ (3,606,000) | $ (57,885,000) | ||
| Company Selected Measure Amount | (5,480,000) | (16,507,000) | (86,431,000) | ||
| PEO Name | Mr. Levin | Mr. Trojan | Mr. Levin | Mr. Trojan | |
| Measure [Axis]: 1 | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Measure Name | Operating Income | ||||
| Measure [Axis]: 2 | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Measure Name | Comparable Restaurant Sales as measured against Black Box | ||||
| Measure [Axis]: 3 | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Measure Name | Weekly Sales Average | ||||
| Mr. Levin [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| PEO Total Compensation Amount | $ 2,650,029 | $ 2,519,663 | |||
| PEO Actually Paid Compensation Amount | 1,945,628 | 2,579,184 | |||
| Mr. Trojan [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| PEO Total Compensation Amount | 3,711,615 | $ 2,420,804 | |||
| PEO Actually Paid Compensation Amount | 4,267,251 | 3,039,372 | |||
| PEO [Member] | Mr. Levin [Member] | Stock Award Value Reported in Summary Compensation Table for the Fiscal Year | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (1,000,047) | (908,372) | |||
| PEO [Member] | Mr. Levin [Member] | Option Award Value Reported in Summary Compensation Table for the Fiscal Year | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (499,884) | (641,625) | |||
| PEO [Member] | Mr. Levin [Member] | Year End Fair Value of Equity Awards Granted During the Fiscal Year that Remain Outstanding and Unvested as of Last Day of the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 1,331,266 | 1,408,643 | |||
| PEO [Member] | Mr. Levin [Member] | Year over Year Change in Fair Value as of the Last Day of the Fiscal Year of Outstanding and Unvested Equity Awards Granted in Prior Years [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (461,714) | 11,391 | |||
| PEO [Member] | Mr. Levin [Member] | Year over Year Change in Fair Value as of the Vesting Date of Equity Awards Granted in Prior Years that Vested During the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (76,232) | 183,544 | |||
| PEO [Member] | Mr. Levin [Member] | Value of Dividends or other Earnings Paid on Stock or Option Awards Not Otherwise Reflected in Fair Value or Total Compensation for the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 2,210 | 5,940 | |||
| PEO [Member] | Mr. Trojan [Member] | Stock Award Value Reported in Summary Compensation Table for the Fiscal Year | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (1,333,370) | (1,069,905) | |||
| PEO [Member] | Mr. Trojan [Member] | Option Award Value Reported in Summary Compensation Table for the Fiscal Year | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (666,559) | (500,260) | |||
| PEO [Member] | Mr. Trojan [Member] | Year End Fair Value of Equity Awards Granted During the Fiscal Year that Remain Outstanding and Unvested as of Last Day of the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 1,997,836 | 1,891,623 | |||
| PEO [Member] | Mr. Trojan [Member] | Year over Year Change in Fair Value as of the Last Day of the Fiscal Year of Outstanding and Unvested Equity Awards Granted in Prior Years [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 29,036 | 119,751 | |||
| PEO [Member] | Mr. Trojan [Member] | Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 69,864 | ||||
| PEO [Member] | Mr. Trojan [Member] | Year over Year Change in Fair Value as of the Vesting Date of Equity Awards Granted in Prior Years that Vested During the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 511,023 | 84,993 | |||
| PEO [Member] | Mr. Trojan [Member] | Value of Dividends or other Earnings Paid on Stock or Option Awards Not Otherwise Reflected in Fair Value or Total Compensation for the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 17,670 | 22,502 | |||
| Non-PEO NEO [Member] | Stock Award Value Reported in Summary Compensation Table for the Fiscal Year | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (145,877) | (219,040) | (230,778) | ||
| Non-PEO NEO [Member] | Option Award Value Reported in Summary Compensation Table for the Fiscal Year | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (72,903) | (85,835) | (100,054) | ||
| Non-PEO NEO [Member] | Year End Fair Value of Equity Awards Granted During the Fiscal Year that Remain Outstanding and Unvested as of Last Day of the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 177,747 | 254,557 | 270,478 | ||
| Non-PEO NEO [Member] | Year over Year Change in Fair Value as of the Last Day of the Fiscal Year of Outstanding and Unvested Equity Awards Granted in Prior Years [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (170,290) | 1,686 | 15,973 | ||
| Non-PEO NEO [Member] | Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | 2,404 | 24,223 | |||
| Non-PEO NEO [Member] | Year over Year Change in Fair Value as of the Vesting Date of Equity Awards Granted in Prior Years that Vested During the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (47,447) | 49,705 | 8,989 | ||
| Non-PEO NEO [Member] | Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | (66,235) | ||||
| Non-PEO NEO [Member] | Value of Dividends or other Earnings Paid on Stock or Option Awards Not Otherwise Reflected in Fair Value or Total Compensation for the Fiscal Year [Member] | |||||
| Pay vs Performance Disclosure [Table] | |||||
| Adjustment to Compensation Amount | $ 1,256 | $ 1,603 | $ 2,679 | ||
