XML 20 R46.htm IDEA: XBRL DOCUMENT v2.4.1.9
INCOME TAXES (Schedule of Effective Income Tax Rate Reconcilliation) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Abstract]      
Statutory federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Executive compensation limitation 0.90%ntri_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationLimitation 1.60%ntri_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationLimitation 0.00%ntri_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationLimitation
Executive stock-based compensation 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 13.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Food donations (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions (2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions 8.90%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions
Fixed assets (1.40%)ntri_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseFixedAssets 0.00%ntri_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseFixedAssets (7.50%)ntri_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseFixedAssets
Changes in reserves 0.10%ntri_EffectiveIncomeTaxRateReconciliationChangeInReserves (6.70%)ntri_EffectiveIncomeTaxRateReconciliationChangeInReserves 4.50%ntri_EffectiveIncomeTaxRateReconciliationChangeInReserves
Tax credits (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Other (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Valuation allowance 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 7.10%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective income tax rate 33.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 56.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations