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Related Party Transactions - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 28, 2019 USD ($) Supplier | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |
Total annual rental payments to the partnership / corporation under the lease arrangement | $ 1.6 | $ 1.6 | $ 1.6
Lease expiration date | Dec. 31, 2022 |  |
Lease effective date | Jan. 01, 2018 |  |
Minority interests in number of suppliers | two |  |
Purchases from companies | $ 23.2 | $ 20.3 | $ 16.5
Joint Venture [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of suppliers with company partners Joint Venture | Supplier | 1 |  |

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

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- Definition Number of other companies in which minority interest owned. + References No definition available. + Details
Name: | dorm_NumberOfOtherCompaniesInWhichMinorityInterestOwned
Namespace Prefix: | dorm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of suppliers with Company partners Joint Venture. + References No definition available. + Details
Name: | dorm_NumberOfSuppliersWithCompanyPartnersJointVenture
Namespace Prefix: | dorm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |