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STOCKHOLDERS' EQUITY: (Details 6) (USD $)
9 Months Ended 12 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Accumulated balances for each component of other comprehensive income        
Foreign currency translation   $ 9,612,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 13,686,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax  
Unrealized loss on interest rate swap   (199,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (24,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Accumulated Other Comprehensive Income   9,413,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 13,662,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Performance-based        
Share-based compensation activity        
Granted (in shares) 312,575us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
     
Outstanding at the end of the period (in shares) 312,575us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
     
Share-based compensation, Weighted average fair value per share at grant date        
Granted (in dollars per share) $ 5.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
     
Outstanding at the end of the period (in dollars per share) $ 5.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
     
Weighted-average remaining contractual term        
Outstanding at the end of the period (in years) 2 years 4 months 10 days      
Share-based Activity - Other disclosures        
Aggregate fair value of restricted stock units granted   1,600,000acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodTotalFairValue
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
   
Share-based compensation expense   300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
   
Future share-based compensation expense expected   1,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
   
Vesting based on attainment of certain revenue targets from April 1, 2014 to March 31, 2017        
Share-based compensation activity        
Granted (in shares)   201,464us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member
   
Share-based Activity - Other disclosures        
Consecutive trading days during the performance period   20 days    
Vesting based on attainment of certain revenue targets from April 1, 2014 to March 31, 2017 | Minimum        
Share-based Activity - Other disclosures        
Performance share awards vested (as a percent)   0.00%acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEquityInstrumentOtherThanOptionsPercentageOfVesting
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member
   
Price (in dollars per share)   $ 40us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member
   
Vesting based on attainment of certain revenue targets from April 1, 2014 to March 31, 2017 | Maximum        
Share-based Activity - Other disclosures        
Performance share awards vested (as a percent)   100.00%acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEquityInstrumentOtherThanOptionsPercentageOfVesting
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member
   
Price (in dollars per share)   $ 70us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member
   
Vesting based on attainment of certain revenue targets from April 1, 2015 to March 31, 2018        
Share-based compensation activity        
Granted (in shares)   111,111us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12015ToMarch312018Member
   
Share-based Activity - Other disclosures        
Consecutive trading days during the performance period   20 days    
Vesting based on attainment of certain revenue targets from April 1, 2015 to March 31, 2018 | Minimum        
Share-based Activity - Other disclosures        
Performance share awards vested (as a percent)   0.00%acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEquityInstrumentOtherThanOptionsPercentageOfVesting
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12015ToMarch312018Member
   
Price (in dollars per share)   $ 25us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12015ToMarch312018Member
   
Vesting based on attainment of certain revenue targets from April 1, 2015 to March 31, 2018 | Maximum        
Share-based Activity - Other disclosures        
Performance share awards vested (as a percent)   100.00%acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEquityInstrumentOtherThanOptionsPercentageOfVesting
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12015ToMarch312018Member
   
Price (in dollars per share)   $ 45us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12015ToMarch312018Member
   
ESPP        
Share-based Activity - Other disclosures        
Number of shares available for issuance   900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
   
Shares purchased by the employees   88,603us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
88,603us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
88,603us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
Share-based compensation expense   $ 100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember