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COMMITMENTS AND CONTINGENCIES Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Minimum [Member]  
Loss Contingencies [Line Items]  
Product Warranty Period 30 days
Maximum [Member]  
Loss Contingencies [Line Items]  
Product Warranty Period 3 years
Individual Labor Action [Member] | Pending Litigation [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Number of Plaintiffs 500us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= atml_IndividualLaborActionMember
Purchase Commitment [Member]  
Loss Contingencies [Line Items]  
Capital purchase commitment 11.0us-gaap_PurchaseObligation
/ atml_CapitalpurchaseAxis
= us-gaap_PurchaseCommitmentMember
Purchase Commitment [Member]  
Loss Contingencies [Line Items]  
Capital purchase commitment 38.9us-gaap_PurchaseObligation
/ atml_WaferpurchaseAxisAxis
= us-gaap_PurchaseCommitmentMember