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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustment, net of tax $ (1,412)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax $ (245)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Unrealized gain (loss) on investments, net of tax 167us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 48us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at beginning of period 871us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Current-period other comprehensive income (1,245)us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] (197)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Balance at end of period (374)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Foreign currency translation adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustment, net of tax (1,412)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 [1]  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at beginning of period 848us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		  
Balance at end of period (564)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		  
Unrealized gain (loss) on marketable securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Unrealized gain (loss) on investments, net of tax 167us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [1],[2]  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at beginning of period 23us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Balance at end of period $ 190us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
[1] The tax impact on foreign currency translation adjustment and unrealized gain on marketable securities was de minimis for the period ending March 27, 2015.
[2] Consists of deferred compensation plan accounts, which includes mutual funds.