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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 29, 2023 | Dec. 30, 2022 | Dec. 31, 2021 | Jan. 01, 2021
Pay vs Performance Disclosure |  |  |  |
Pay vs Performance Disclosure, Table | PAY VERSUS PERFORMANCE DISCLOSURE The following table provides information on compensation for the principal executive officer (“PEO”), the average compensation for the other Named Executive Officers (“Non-PEO NEOs”) and certain measures of the Company’s financial performance for the last three fiscal years ended December 29, 2023:
|  |  |  |  |  |  |  |  |  |  |  |  |  | Value of Initial Fixed $100 Investment Based on: |  |  |  |  |  |  |
Year |  | Summary Compensation Table Total for PEO ($)(1) |  |  | Compensation Actually Paid to PEO ($)(1)(2) |  |  | Average Summary Compensation Table Total for Non-PEO NEOs ($)(1) |  |  | Average Compensation Actually Paid to Non-PEO NEOs ($)(1)(2) |  |  | Total Shareholder Return (3) |  |  | Peer Group Total Shareholder Return (4) |  |  | Net Income ($ '000) (5) |  |  | EBITDA ($ '000) (6) |
2023 |  |  | 3,558,964 |  |  |  | 2,829,817 |  |  |  | 1,885,140 |  |  |  | 1,683,408 |  |  |  | 130 |  |  |  | 144 |  |  |  | 100,339 |  |  |  | 137,662 |
2022 |  |  | 3,589,062 |  |  |  | 2,322,702 |  |  |  | 1,626,994 |  |  |  | 1,245,805 |  |  |  | 145 |  |  |  | 124 |  |  |  | 102,330 |  |  |  | 137,217 |
2021 |  |  | 3,022,417 |  |  |  | 5,151,590 |  |  |  | 1,500,913 |  |  |  | 2,165,705 |  |  |  | 169 |  |  |  | 142 |  |  |  | 101,202 |  |  |  | 132,258 |
2020 |  |  | 2,674,793 |  |  |  | 4,300,765 |  |  |  | 1,362,236 |  |  |  | 1,938,548 |  |  |  | 129 |  |  |  | 114 |  |  |  | 82,552 |  |  |  | 102,102 |
(1) Dr. Corrigan was the PEO in 2023, 2022 and 2021. Mr. Schlenker, Dr. Guyer, Dr. Rakow and Dr. Reitman were the non-PEO NEOs in 2023. Mr. Schlenker, Dr. Murray, Dr. Reitman and Dr. Pye were the non-PEO NEOs in 2022. Mr. Schlenker, Dr. Murray, Dr. Reitman and Dr. Doyle were the non-PEO NEOs in 2021. Mr. Schlenker, Dr. Murray, Dr. Reitman and Dr. James were the non-PEO NEOs in 2020.The value of the “compensation actually paid” to our PEO and Non-PEO NEOs reflect the following adjustments from the Summary Compensation Table: (2) Amounts represent the cumulative Total Shareholder Return ("TSR") for Exponent calculated and presented as the dollar value of an investment of $100 made on January 3, 2020, assuming dividend reinvestment. (3) Amounts represent the cumulative TSR for the S&P 400 Mid Cap Index as "Peer Group" calculated and presented as the dollar value of an investment of $100 made on January 3, 2020, assuming dividend reinvestment. (4) Net Income is calculated in accordance with generally accepted accounting principles. (5) EBITDA is our company-selected measure and is defined as net income before income taxes, interest income, depreciation and amortization.
Compensation Actually Paid Adjustment Summary |  | Principal Executive Officer ($)(PEO) |  |  | NON PEO Named Executive Officers ($)(NEO) (average) |
|  | 2023 |  |  | 2023 |
Summary Compensation Table (SCT) Total |  |  | 3,558,964 |  |  |  | 1,885,140 |
Stock and option award values reported in the SCT |  |  | (1,889,339 | ) |  |  | (740,008 | )
The year-end fair value of any outstanding and unvested stock awards granted during the year |  |  | 528,152 |  |  |  | 275,125 |
The year-end fair value of any outstanding and unvested option awards granted during the year |  |  | 392,673 |  |  |  | 65,445 |
The change in fair value as of the vesting date (from the end of the prior year) of any stock awards that vest during the year |  |  | 30,318 |  |  |  | 12,366 |
The change in fair value as of the vesting date (from the end of the prior year) of any option awards that vest during the year |  |  | 161,226 |  |  |  | 26,871 |
The change in year-end fair value (from the end of the prior year) of any outstanding and unvested stock awards granted in prior years |  |  | (183,518 | ) |  |  | (92,649 | )
The change in year-end fair value (from the end of the prior year) of any outstanding and unvested option awards granted in prior years |  |  | (368,678 | ) |  |  | (61,445 | )
'The dollar value of stock awards that were both granted and vested during the year |  |  | 600,019 |  |  |  | 312,563 |
The dollar value of any dividends or other earnings paid on stock or option awards during the year (prior to vesting) that are not otherwise reflected |  |  | — |  |  |  | — |
Compensation Actually Paid |  |  | 2,829,817 |  |  |  | 1,683,408 |
Company Selected Measure Name | EBITDA |  |  |
Named Executive Officers, Footnote | Dr. Corrigan was the PEO in 2023, 2022 and 2021. Mr. Schlenker, Dr. Guyer, Dr. Rakow and Dr. Reitman were the non-PEO NEOs in 2023. Mr. Schlenker, Dr. Murray, Dr. Reitman and Dr. Pye were the non-PEO NEOs in 2022. Mr. Schlenker, Dr. Murray, Dr. Reitman and Dr. Doyle were the non-PEO NEOs in 2021. Mr. Schlenker, Dr. Murray, Dr. Reitman and Dr. James were the non-PEO NEOs in 2020. |  |  |
Peer Group Issuers, Footnote | Amounts represent the cumulative TSR for the S&P 400 Mid Cap Index as "Peer Group" calculated and presented as the dollar value of an investment of $100 made on January 3, 2020, assuming dividend reinvestment. |  |  |
PEO Total Compensation Amount | $ 3,558,964 | $ 3,589,062 | $ 3,022,417 | $ 2,674,793
PEO Actually Paid Compensation Amount | $ 2,829,817 | 2,322,702 | 5,151,590 | 4,300,765
Adjustment To PEO Compensation, Footnote |
Compensation Actually Paid Adjustment Summary |  | Principal Executive Officer ($)(PEO) |  |  | NON PEO Named Executive Officers ($)(NEO) (average) |
|  | 2023 |  |  | 2023 |
Summary Compensation Table (SCT) Total |  |  | 3,558,964 |  |  |  | 1,885,140 |
Stock and option award values reported in the SCT |  |  | (1,889,339 | ) |  |  | (740,008 | )
The year-end fair value of any outstanding and unvested stock awards granted during the year |  |  | 528,152 |  |  |  | 275,125 |
The year-end fair value of any outstanding and unvested option awards granted during the year |  |  | 392,673 |  |  |  | 65,445 |
The change in fair value as of the vesting date (from the end of the prior year) of any stock awards that vest during the year |  |  | 30,318 |  |  |  | 12,366 |
The change in fair value as of the vesting date (from the end of the prior year) of any option awards that vest during the year |  |  | 161,226 |  |  |  | 26,871 |
The change in year-end fair value (from the end of the prior year) of any outstanding and unvested stock awards granted in prior years |  |  | (183,518 | ) |  |  | (92,649 | )
The change in year-end fair value (from the end of the prior year) of any outstanding and unvested option awards granted in prior years |  |  | (368,678 | ) |  |  | (61,445 | )
'The dollar value of stock awards that were both granted and vested during the year |  |  | 600,019 |  |  |  | 312,563 |
The dollar value of any dividends or other earnings paid on stock or option awards during the year (prior to vesting) that are not otherwise reflected |  |  | — |  |  |  | — |
Compensation Actually Paid |  |  | 2,829,817 |  |  |  | 1,683,408 |
Non-PEO NEO Average Total Compensation Amount | $ 1,885,140 | 1,626,994 | 1,500,913 | 1,362,236
Non-PEO NEO Average Compensation Actually Paid Amount | $ 1,683,408 | 1,245,805 | 2,165,705 | 1,938,548
Adjustment to Non-PEO NEO Compensation Footnote |
Compensation Actually Paid Adjustment Summary |  | Principal Executive Officer ($)(PEO) |  |  | NON PEO Named Executive Officers ($)(NEO) (average) |
|  | 2023 |  |  | 2023 |
Summary Compensation Table (SCT) Total |  |  | 3,558,964 |  |  |  | 1,885,140 |
Stock and option award values reported in the SCT |  |  | (1,889,339 | ) |  |  | (740,008 | )
The year-end fair value of any outstanding and unvested stock awards granted during the year |  |  | 528,152 |  |  |  | 275,125 |
The year-end fair value of any outstanding and unvested option awards granted during the year |  |  | 392,673 |  |  |  | 65,445 |
The change in fair value as of the vesting date (from the end of the prior year) of any stock awards that vest during the year |  |  | 30,318 |  |  |  | 12,366 |
The change in fair value as of the vesting date (from the end of the prior year) of any option awards that vest during the year |  |  | 161,226 |  |  |  | 26,871 |
The change in year-end fair value (from the end of the prior year) of any outstanding and unvested stock awards granted in prior years |  |  | (183,518 | ) |  |  | (92,649 | )
The change in year-end fair value (from the end of the prior year) of any outstanding and unvested option awards granted in prior years |  |  | (368,678 | ) |  |  | (61,445 | )
'The dollar value of stock awards that were both granted and vested during the year |  |  | 600,019 |  |  |  | 312,563 |
The dollar value of any dividends or other earnings paid on stock or option awards during the year (prior to vesting) that are not otherwise reflected |  |  | — |  |  |  | — |
Compensation Actually Paid |  |  | 2,829,817 |  |  |  | 1,683,408 |
Compensation Actually Paid vs. Net Income |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |
Total Shareholder Return Vs Peer Group |  |  |  |
Tabular List, Table | Performance Measures. The following table lists the most important financial performance measures used to link CAP to the PEO and Non-PEO NEOs for the fiscal year ended December 29, 2023:
EBITDA
Revenues before reimbursement growth
EBITDA margin
Total Shareholder Return Amount | $ 130 | 145 | 169 | 129
Peer Group Total Shareholder Return Amount | 144 | 124 | 142 | 114
Net Income (Loss) | $ 100,339,000 | $ 102,330,000 | $ 101,202,000 | $ 82,552,000
Company Selected Measure Amount | 137,662,000 | 137,217,000 | 132,258,000 | 102,102,000
PEO Name | Dr. Corrigan | Dr. Corrigan | Dr. Corrigan |
Measure:: 1 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | EBITDA |  |  |
Non-GAAP Measure Description | EBITDA is our company-selected measure and is defined as net income before income taxes, interest income, depreciation and amortization |  |  |
Measure:: 2 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Revenues before reimbursement growth |  |  |
Measure:: 3 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | EBITDA margin |  |  |
PEO | Stock and option award values reported in the SCT [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ (1,889,339) |  |  |
PEO | Year-end Fair Value Of Any Outstanding And Unvested Stock Awards Granted During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 528,152 |  |  |
PEO | Year-end Fair Value Of Any Outstanding And Unvested Option Awards Granted During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 392,673 |  |  |
PEO | Change In Fair Value As Of The Vesting Date (From The End Of The Prior Year) Of Any Stock Awards That Vest During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 30,318 |  |  |
PEO | Change In Fair Value As Of The Vesting Date (From The End Of The Prior Year) Of Any Option Awards That Vest During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 161,226 |  |  |
PEO | Change In Year-end Fair Value (From The End Of The Prior Year) Of Any Outstanding And Unvested Stock Awards Granted In Prior Years [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (183,518) |  |  |
PEO | Change In Year-end Fair Value (From The End Of The Prior Year) Of Any Outstanding And Unvested Option Awards Granted In Prior Years [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (368,678) |  |  |
PEO | Dollar Value Of Stock Awards That Were Both Granted And Vested During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 600,019 |  |  |
Non-PEO NEO | Stock and option award values reported in the SCT [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (740,008) |  |  |
Non-PEO NEO | Year-end Fair Value Of Any Outstanding And Unvested Stock Awards Granted During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 275,125 |  |  |
Non-PEO NEO | Year-end Fair Value Of Any Outstanding And Unvested Option Awards Granted During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 65,445 |  |  |
Non-PEO NEO | Change In Fair Value As Of The Vesting Date (From The End Of The Prior Year) Of Any Stock Awards That Vest During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 12,366 |  |  |
Non-PEO NEO | Change In Fair Value As Of The Vesting Date (From The End Of The Prior Year) Of Any Option Awards That Vest During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 26,871 |  |  |
Non-PEO NEO | Change In Year-end Fair Value (From The End Of The Prior Year) Of Any Outstanding And Unvested Stock Awards Granted In Prior Years [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (92,649) |  |  |
Non-PEO NEO | Change In Year-end Fair Value (From The End Of The Prior Year) Of Any Outstanding And Unvested Option Awards Granted In Prior Years [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (61,445) |  |  |
Non-PEO NEO | Dollar Value Of Stock Awards That Were Both Granted And Vested During The Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ 312,563 |  |  |

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