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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 12, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 000-25826    
Entity Registrant Name HARMONIC INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 77-0201147    
Entity Address, Address Line One 2590 Orchard Parkway    
Entity Address, City or Town San Jose    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95131    
City Area Code 408    
Local Phone Number 542-2500    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol HLIT    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
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     $ 1,259.4
Entity Common Stock, Shares Outstanding   111,908,849  
Documents Incorporated by Reference
Portions of the Proxy Statement for the Registrant’s 2024 Annual Meeting of Stockholders (which will be filed with the Securities and Exchange Commission within 120 days of the end of the fiscal year ended December 31, 2023) are incorporated by reference in Part III of this Annual Report on Form 10-K.
    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000851310