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GOODWILL AND INTANGIBLE ASSETS, NET (Schedule of Estimated Future Amortization) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
2015 $ 11,397us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 8,416us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 7,328us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 4,926us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 1,568us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 16,651us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total future amortization 50,286us-gaap_FiniteLivedIntangibleAssetsNet 28,116us-gaap_FiniteLivedIntangibleAssetsNet
Patented Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
2015 1,872us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
 
2016 1,564us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
 
2017 1,362us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
 
2018 97us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
 
2019 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
 
Thereafter 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
 
Total future amortization 4,895us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentedTechnologyMember
 
Acquisition Related Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
2015 9,525us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= atml_AcquisitionRelatedIntangibleAssetsMember
 
2016 6,852us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= atml_AcquisitionRelatedIntangibleAssetsMember
 
2017 5,966us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= atml_AcquisitionRelatedIntangibleAssetsMember
 
2018 4,829us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= atml_AcquisitionRelatedIntangibleAssetsMember
 
2019 1,568us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= atml_AcquisitionRelatedIntangibleAssetsMember
 
Thereafter 16,651us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= atml_AcquisitionRelatedIntangibleAssetsMember
 
Total future amortization $ 45,391us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= atml_AcquisitionRelatedIntangibleAssetsMember
$ 22,772us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= atml_AcquisitionRelatedIntangibleAssetsMember