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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 28, 2019
Feb. 21, 2020
Jun. 29, 2019
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description This Amendment No.1 (the “Amendment No. 1”) to the Annual Report on Form 10-K of Dorman Products, Inc. (the “Company”) for the year ended December 28, 2019 as filed with the U.S. Securities and Exchange Commission on February 26, 2020 (the “Original Form 10-K”), is being filed for the sole purpose of correcting the Consent of Independent Registered Public Accounting Firm (the “Consent”). The original Consent incorrectly included a reference to Flight Systems Automotive Group and was filed as a result of an administrative error. A corrected Consent is filed as Exhibit 23.1 attached hereto. Except as otherwise expressly noted herein, this Amendment No. 1 does not modify or update in any way the financial position, results of operations, cash flows, or other disclosures in, or exhibits to, the Original Form 10-K, nor does it reflect events occurring after the filing of the Original Form 10-K. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Form 10-K. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), new certifications by the Company’s principal executive officer and principal financial officer are filed herewith as exhibits to this Amendment No. 1 pursuant to Rule 13a-14(a) or 15d-14(a) of the Exchange Act. As no financial statements have been included in this Amendment No. 1 and it does not contain or amend any disclosure with respect to Items 307 or 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. The Company is not including certifications pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) as no financial statements are being filed with this Amendment No. 1.    
Document Period End Date Dec. 28, 2019    
Document Fiscal Year Focus 2019    
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 --12-28    
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    
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   32,554,663  
Entity Public Float     $ 1,964,315,544
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 Annual Meeting of Shareholders, to be filed with the Securities and Exchange Commission within 120 days after December 28, 2019, are incorporated by reference into Part III of this Annual Report on Form 10-K, as amended.