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INCOME TAXES (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
U.S. Federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State tax 2.85%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.56%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.23%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effect of foreign operations 2.13%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (3979.63%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (2.55%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Recognition of tax credits (5.27%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 875.54%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (10.04%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Change of valuation allowance (2.14%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (295.93%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 1.04%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Audit settlements and IRS refunds 1.06%atml_EffectiveIncomeTaxRateReconciliationTaxSettlementsAndIRSRefunds (828.85%)atml_EffectiveIncomeTaxRateReconciliationTaxSettlementsAndIRSRefunds 0.00%atml_EffectiveIncomeTaxRateReconciliationTaxSettlementsAndIRSRefunds
Other, net 4.82%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (4.15%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 4.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax provision rate 38.45%us-gaap_EffectiveIncomeTaxRateContinuingOperations (4194.46%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 27.92%us-gaap_EffectiveIncomeTaxRateContinuingOperations