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INCOME TAXES - Income Tax Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 26, 2014
Sep. 26, 2014
Jun. 27, 2014
Mar. 28, 2014
Dec. 27, 2013
Sep. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 26, 2014
Dec. 27, 2013
Dec. 28, 2012
Effective Income Tax Rate Reconciliation, Amount [Abstract]                      
Income tax expense based on statutory rate                 $ 28,641us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 21,328us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 19,112us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from:                      
State income taxes, net of federal benefit                 3,213us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,536us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,800us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax credits, net                 (18,564)us-gaap_IncomeTaxReconciliationTaxCredits (10,790)us-gaap_IncomeTaxReconciliationTaxCredits (1,915)us-gaap_IncomeTaxReconciliationTaxCredits
Nondeductible/nontaxable items                 1,983us-gaap_IncomeTaxReconciliationNondeductibleExpense 2,124us-gaap_IncomeTaxReconciliationNondeductibleExpense 2,320us-gaap_IncomeTaxReconciliationNondeductibleExpense
Foreign taxes                 1,037us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 488us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 368us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Other, net                 (141)us-gaap_IncomeTaxReconciliationOtherReconcilingItems 327us-gaap_IncomeTaxReconciliationOtherReconcilingItems (709)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Provision for income taxes $ 4,472us-gaap_IncomeTaxExpenseBenefit $ 8,243us-gaap_IncomeTaxExpenseBenefit $ 2,350us-gaap_IncomeTaxExpenseBenefit $ 1,104us-gaap_IncomeTaxExpenseBenefit $ 6,889us-gaap_IncomeTaxExpenseBenefit $ 9,454us-gaap_IncomeTaxExpenseBenefit $ 5,069us-gaap_IncomeTaxExpenseBenefit $ (5,399)us-gaap_IncomeTaxExpenseBenefit $ 16,169us-gaap_IncomeTaxExpenseBenefit $ 16,013us-gaap_IncomeTaxExpenseBenefit $ 20,976us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent [Abstract]                      
Income tax expense based on statutory rate                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from:                      
State income taxes, net of federal benefit                 3.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax credits, net                 (22.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (17.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (3.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Nondeductible/nontaxable items                 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 3.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Foreign taxes                 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Other, net                 (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total taxes on income                 19.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 26.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations