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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity Attributable to Parent $ 469,334us-gaap_StockholdersEquity $ 393,360us-gaap_StockholdersEquity $ 333,674us-gaap_StockholdersEquity $ 293,579us-gaap_StockholdersEquity
Foreign currency translation adjustment, net of tax (1,281)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (689)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 175us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax  
Unrealized gain (loss) on investments, net of tax 119us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1],[2] (96)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1],[2] 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period 2,033us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,818us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,643us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Current-period other comprehensive income (1,162)us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] (785)us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] 175us-gaap_OtherComprehensiveIncomeLossNetOfTax [1]  
Balance at end of period 871us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,033us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,818us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Foreign currency translation adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity Attributable to Parent       2,643us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
Foreign currency translation adjustment, net of tax (1,281)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
[1] (689)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
[1] 175us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
[1]  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period 2,129us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
2,818us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
   
Balance at end of period 848us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
2,129us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
2,818us-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 119us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
[1],[2] (96)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
[1],[2] 0us-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 (96)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
 
Balance at end of period $ 23us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
[2] $ (96)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
$ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
 
[1] The tax impact on foreign currency translation adjustment and unrealized gain (loss) on marketable securities was de minimus for the years ended December 26, 2014, December 27, 2013, and December 28, 2012.
[2] Consists of deferred compensation plan accounts, which includes mutual funds and available-for-sale securities. Available-for-sale securities which give rise to gains and losses are limited to our investments in select certificates of deposit.