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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 26, 2020
Feb. 18, 2021
Jun. 27, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 26, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol DORM    
Title of 12(b) Security Common Stock, $0.01 Par Value    
Security Exchange Name NASDAQ    
Entity Registrant Name DORMAN PRODUCTS, INC.    
Entity Central Index Key 0000868780    
Current Fiscal Year End Date --12-26    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity File Number 0-18914    
Entity Incorporation, State or Country Code PA    
Entity Tax Identification Number 23-2078856    
Entity Address, Address Line One 3400 East Walnut Street    
Entity Address, City or Town Colmar    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 18915    
City Area Code 215    
Local Phone Number 997-1800    
Entity Common Stock, Shares Outstanding   32,177,051  
Entity Public Float     $ 1,412,107,399
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

 

Certain portions of the registrant's definitive proxy statement, in connection with its 2021 Annual Meeting of Shareholders, to be filed with the Securities and Exchange Commission within 120 days after December 26, 2020, are incorporated by reference into PART III of this Annual Report on Form 10-K.