| 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. |
