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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Jan. 03, 2025
Feb. 21, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 03, 2025    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Registrant Name EXPONENT, INC.    
Entity Central Index Key 0000851520    
Current Fiscal Year End Date --01-03    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 3.7
Trading Symbol EXPO    
Entity Common Stock, Shares Outstanding   50,818,234  
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity File Number 0-18655    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 77-0218904    
Entity Address, Address Line One 149 Commonwealth Drive    
Entity Address, City or Town Menlo Park    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94025    
City Area Code 650    
Local Phone Number 326-9400    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Entity Interactive Data Current Yes    
Title of each class Common Stock, par value $0.001 per share    
Name of each exchange on which registered NASDAQ    
Auditor Firm ID 185    
Auditor Name KPMG, LLP    
Auditor Location San Francisco, California    
Document Financial Statement Error Correction [Flag] false    
Documents Incorporated by Reference

Portions of the registrant’s Definitive Proxy Statement for the registrant’s 2025 Annual Meeting of Stockholders to be held on June 5, 2025 are incorporated by reference into Part III of this Annual Report on Form 10-K.

    
Auditor Opinion

Opinions on the Consolidated Financial Statements and Internal Control Over Financial Reporting

We have audited the accompanying consolidated balance sheets of Exponent, Inc. and subsidiaries (the Company) as of January 3, 2025 and December 29, 2023, the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the fiscal years in the three-year period ended January 3, 2025, and the related notes and financial statement schedule II (collectively, the consolidated financial statements). We also have audited the Company’s internal control over financial reporting as of January 3, 2025, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

 

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of January 3, 2025 and December 29, 2023, and the results of its operations and its cash flows for each of the fiscal years in the three-year period ended January 3, 2025, in conformity with U.S. generally accepted accounting principles. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of January 3, 2025 based on criteria established in Internal Control – Integrated Framework (2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission.