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Sales of Accounts Receivable - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Dec. 27, 2014
Receivables [Abstract]      
Sale of accounts receivable $ 132.9us-gaap_ProceedsFromSaleOfFinanceReceivables $ 124.1us-gaap_ProceedsFromSaleOfFinanceReceivables  
Additional account receivables outstanding if receivables had not been sold 314.6dorm_ReceivablesNotSoldAdditionalReceivablesOutstanding   298.9dorm_ReceivablesNotSoldAdditionalReceivablesOutstanding
Factoring costs associated with the sales of accounts receivable $ 1.7us-gaap_GainLossOnSaleOfAccountsReceivable $ 1.5us-gaap_GainLossOnSaleOfAccountsReceivable