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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 27, 2025
Feb. 04, 2026
Jun. 27, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 27, 2025    
Document Transition Report false    
Entity File Number 1-4298    
Entity Registrant Name COHU, INC    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-1934119    
Entity Address, Address Line One 17087 Via Del Campo    
Entity Address, City or Town San Diego    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92127-1711    
City Area Code 858    
Local Phone Number 848-8100    
Title of 12(b) Security Common Stock, $1.00    
Trading Symbol COHU    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 879,400,000
Entity Common Stock, Shares Outstanding (in shares)   46,888,325  
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location San Diego, California    
Entity Central Index Key 0000021535    
Current Fiscal Year End Date --12-27    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false