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OPERATING AND GEOGRAPHICAL SEGMENTS (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Fair value of investment 1,066us-gaap_InvestmentOwnedAtFairValue 3,247us-gaap_InvestmentOwnedAtFairValue  
Goodwill 191,088us-gaap_Goodwill 108,240us-gaap_Goodwill 104,430us-gaap_Goodwill
Intangible assets, net 50,286us-gaap_FiniteLivedIntangibleAssetsNet 28,116us-gaap_FiniteLivedIntangibleAssetsNet  
Non-current deferred tax assets 117,278us-gaap_DeferredTaxAssetsNetNoncurrent 134,365us-gaap_DeferredTaxAssetsNetNoncurrent  
Major Distributor with Largest Balance [Member] | Sales Revenue, Goods, Net [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage     12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= atml_MajorDistributorWithLargestBalanceMember
Major Customer with Largest Balance [Member] | Sales Revenue, Goods, Net [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= atml_MajorCustomerWithLargestBalanceMember
14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= atml_MajorCustomerWithLargestBalanceMember
 
Major Customer with Second Largest Balance [Member] | Sales Revenue, Goods, Net [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= atml_MajorCustomerWithSecondLargestBalanceMember
12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= atml_MajorCustomerWithSecondLargestBalanceMember
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= atml_MajorCustomerWithSecondLargestBalanceMember
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]      
Segment Reporting Information [Line Items]      
Number of customers with concentration risk     1atml_ConcentrationRiskNumberofMajorCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Customer Concentration Risk [Member] | Major Distributor with Largest Balance [Member] | Sales Revenue, Goods, Net [Member]      
Segment Reporting Information [Line Items]      
Number of customers with concentration risk     1atml_ConcentrationRiskNumberofMajorCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= atml_MajorDistributorWithLargestBalanceMember
Concentration Risk, Percentage 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= atml_MajorDistributorWithLargestBalanceMember
   
Concentration Risk, Number of Major Distributor 2atml_ConcentrationRiskNumberofMajorDistributor
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= atml_MajorDistributorWithLargestBalanceMember
  1atml_ConcentrationRiskNumberofMajorDistributor
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= atml_MajorDistributorWithLargestBalanceMember
Customer Concentration Risk [Member] | Major Distributor with Second Largest Balance [Member] | Sales Revenue, Goods, Net [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= atml_MajorDistributorWithSecondLargestBalanceMember
   
Credit Concentration Risk [Member] | Accounts Receivable [Member]      
Segment Reporting Information [Line Items]      
Number of customers with concentration risk 0atml_ConcentrationRiskNumberofMajorCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
0atml_ConcentrationRiskNumberofMajorCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
 
Concentration Risk, Number of Major Distributor 2atml_ConcentrationRiskNumberofMajorDistributor
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
1atml_ConcentrationRiskNumberofMajorDistributor
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
 
Credit Concentration Risk [Member] | Major Distributor with Largest Balance [Member] | Accounts Receivable [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= atml_MajorDistributorWithLargestBalanceMember
   
Credit Concentration Risk [Member] | Major Distributor with Second Largest Balance [Member] | Accounts Receivable [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= atml_MajorDistributorWithSecondLargestBalanceMember
   
Credit Concentration Risk [Member] | Major Customer with Largest Balance [Member] | Accounts Receivable [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage   20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= atml_MajorCustomerWithLargestBalanceMember
 
Credit Concentration Risk [Member] | Major Customer with Second Largest Balance [Member] | Accounts Receivable [Member]      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= atml_MajorCustomerWithSecondLargestBalanceMember
   
Auction Rate Securities [Member]      
Segment Reporting Information [Line Items]      
Fair value of investment 1,066us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRateSecuritiesMember
1,066us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_AuctionRateSecuritiesMember