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Business Acquisitions and Investments - Summary of Preliminary Fair Value of Total Consideration (Parenthetical) (Detail) $ in Millions | Oct. 26, 2017 USD ($)
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MAS Automotive Distribution Inc [Member] |
Business Acquisition [Line Items] |
Business acquisition, cash received | $ 3.3

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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 The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=dorm_MASAutomotiveDistributionIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |