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STOCKHOLDERS' EQUITY: (Details 2) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jul. 01, 2014
Mar. 31, 2015
May 13, 2013
Mar. 31, 2014
multiple
Mar. 31, 2013
multiple
May 23, 2013
LiveRamp Inc            
Share-based compensation            
Fair value of stock options included in purchase price $ 6,978,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
         
Stock options assumed allocated to future services 23,500,000acxm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFairValueOfStockOptionsAssumedAllocatedToFutureServices
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
         
Performance-based            
Share-based compensation            
Share-based compensation expense   300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
       
Stock Option and Equity Compensation Plans            
Share-based compensation            
Aggregate number of shares reserved for issuance under equity compensation plans since the inception of such plans   26,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= acxm_StockOptionAndEquityCompensationPlansMember
       
Additional shares authorized for issuance     4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= acxm_StockOptionAndEquityCompensationPlansMember
     
Shares which remained available for future grants   3,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= acxm_StockOptionAndEquityCompensationPlansMember
       
Stock option and equity compensation plan terminated            
Share-based compensation            
Shares which remained available for future grants           1,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= acxm_StockOptionAndEquityCompensationTerminatedPlanMember
Stock options            
Share-based compensation            
Granted (in shares)   415,639us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Per-share weighted-average fair value of the stock options granted (in dollars per share)   $ 8.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  $ 6.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 5.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Pricing model used for share-based compensation arrangement   binomial lattice   binomial lattice binomial lattice  
Dividend yield (as a percent)   0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Risk-free interest rate (as a percent)   2.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Expected option life   4 years 4 months 24 days   4 years 3 months 18 days 4 years 6 months  
Expected volatility (as a percent)   43.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  35.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
43.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Suboptimal exercise multiple   1.4acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSuboptimalExerciseMultiple
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  1.3acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSuboptimalExerciseMultiple
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.4acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSuboptimalExerciseMultiple
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Share-based compensation expense   12,100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  2,300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Future share-based compensation expense expected   17,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Period for recognition of unrecognized stock-based compensation expense   4 years        
Stock Option Activity - Number of Shares            
Outstanding at the beginning of the period (in shares)   4,538,518us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Granted (in shares)   415,639us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Exercised (in shares)   (648,460)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Forfeited or cancelled (in shares)   (886,319)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Outstanding at the end of the period (in shares)   4,893,046us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  4,538,518us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Exercisable at the end of the period (in shares)   3,152,866us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
LiveRamp replacement stock options   1,473,668us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Weighted-average exercise price per share            
Outstanding at the beginning of the period (in dollars per share)   $ 20.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Granted (in dollars per share)   $ 21.01us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Exercised (in dollars per share)   $ 6.67us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Forfeited or cancelled (in dollars per share)   $ 27.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Outstanding at the end of the period (in dollars per share)   $ 15.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  $ 20.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Exercisable at the end of the period (in dollars per share)   $ 17.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
LiveRamp replacement stock options (in dollars per share)   $ 1.37us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsOtherShareIncreaseDecreaseInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Weighted-average remaining contractual term            
Outstanding at the end of the period   4 years 8 months 23 days        
Exercisable at the end of the period   3 years 22 days        
Aggregate intrinsic value            
Exercised   8,293,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  51,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Outstanding at the end of the period   27,403,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Exercisable at the end of the period   11,560,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Stock options | LiveRamp Inc            
Share-based compensation            
Pricing model used for share-based compensation arrangement   binomial lattice        
Dividend yield (as a percent)   0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
       
Expected volatility (as a percent)   43.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
       
Suboptimal exercise multiple   1.4acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsSuboptimalExerciseMultiple
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
       
Share-based compensation expense   $ 9,400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
       
Minimum risk-free interest rate (as a percent)   1.57%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
       
Maximum risk-free interest rate (as a percent)   2.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
       
LiveRamp stock option exchange ratio   0.63774%acxm_BusinessCombinationReplacementStockOptionExchangeRatio
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
       
Stock Option Activity - Number of Shares            
LiveRamp replacement stock options   1,473,668us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
       
Stock options | Minimum | LiveRamp Inc            
Share-based compensation            
Expected option life   6 years 1 month 6 days        
Stock options | Maximum | LiveRamp Inc            
Share-based compensation            
Expected option life   9 years 8 months 12 days