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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 28, 2015
Dec. 27, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts and customer credits $ 79,274dorm_AllowanceForDoubtfulAccountsAndCustomerCredits $ 79,179dorm_AllowanceForDoubtfulAccountsAndCustomerCredits
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 35,645,867us-gaap_CommonStockSharesIssued 35,611,238us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 35,645,867us-gaap_CommonStockSharesOutstanding 35,611,238us-gaap_CommonStockSharesOutstanding