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Related Party Transactions - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 26, 2020 USD ($) Supplier | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |
Rental payments based upon the terms of the lease | $ | $ 1.8 | $ 1.6 | $ 1.6
Lease effective date | Jan. 01, 2018 |  |
Purchases from companies and from PTI prior to full acquisition | $ | $ 10.7 | $ 23.2 | $ 20.3
Joint Venture [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of suppliers with company partners Joint Venture | Supplier | 1 |  |
Minority interests in number of suppliers | Supplier | 2 |  |
Colmar, PA [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Lease expiration date | Dec. 31, 2022 |  |
Lewisberry, PA [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Lease expiration date | Dec. 31, 2027 |  |

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- Definition Lease effective date. + References No definition available. + Details
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Namespace Prefix: | dorm_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Noncontrolling interest in number of suppliers. + References No definition available. + Details
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- Definition Number of suppliers with Company partners Joint Venture. + References No definition available. + Details
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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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Data Type: | xbrli:dateItemType
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41499-112717 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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- Details
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- Details
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