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STOCKHOLDERS' EQUITY (Schedule of Allocation of Share-based Compensation Costs) (Details) (Total stock-based compensation expense, excluding acquisition-related charges, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock-based compensation expense      
Stock-based compensation expense $ 59,679us-gaap_AllocatedShareBasedCompensationExpense $ 43,124us-gaap_AllocatedShareBasedCompensationExpense $ 72,442us-gaap_AllocatedShareBasedCompensationExpense
Net amounts released from (capitalized in) inventory (152)us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 670us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount 468us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Stock Options [Member]      
Stock-based compensation expense      
Stock-based compensation expense 186us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= atml_AggregateIncomeStatmentExpenseExcludingAcquisitionRelatedChargesMember
1,644us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= atml_AggregateIncomeStatmentExpenseExcludingAcquisitionRelatedChargesMember
3,470us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= atml_AggregateIncomeStatmentExpenseExcludingAcquisitionRelatedChargesMember
Employee Stock [Member]      
Stock-based compensation expense      
Stock-based compensation expense 2,803us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_IncomeStatementLocationAxis
= atml_AggregateIncomeStatmentExpenseExcludingAcquisitionRelatedChargesMember
2,858us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_IncomeStatementLocationAxis
= atml_AggregateIncomeStatmentExpenseExcludingAcquisitionRelatedChargesMember
3,107us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_IncomeStatementLocationAxis
= atml_AggregateIncomeStatmentExpenseExcludingAcquisitionRelatedChargesMember
Restricted Stock Units (RSUs) [Member]      
Stock-based compensation expense      
Stock-based compensation expense $ 56,842us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= atml_AggregateIncomeStatmentExpenseExcludingAcquisitionRelatedChargesMember
$ 37,952us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= atml_AggregateIncomeStatmentExpenseExcludingAcquisitionRelatedChargesMember
$ 65,397us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= atml_AggregateIncomeStatmentExpenseExcludingAcquisitionRelatedChargesMember