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STOCKHOLDERS' EQUITY: (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Dec. 31, 2014
Mar. 31, 2015
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   $ 1.6acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodTotalFairValue
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
Share-based compensation expense   0.3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
Future share-based compensation expense expected   1.3us-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
Stock Appreciation Rights (SARs) | Performance-based    
Share-based compensation activity    
Outstanding at the end of the period (in shares)   245,404us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
Share-based compensation, Weighted average fair value per share at grant date    
Outstanding at the end of the period (in dollars per share)   $ 40.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
Weighted-average remaining contractual term    
Outstanding at the end of the period (in years)   2 years
Share-based Activity - Other disclosures    
Share-based compensation expense   0.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
Future share-based compensation expense expected   0.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= us-gaap_PerformanceSharesMember
Stock Appreciation Rights (SARs) | Vesting based on attainment of certain revenue targets from April 1, 2014 to March 31, 2017    
Share-based compensation activity    
Granted (in shares)   245,404us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member
Share-based compensation, Weighted average fair value per share at grant date    
Granted (in dollars per share)   $ 40.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member
Share-based Activity - Other disclosures    
Aggregate fair value of restricted stock units granted   $ 0.5acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member
Performance share awards vested (as a percent)   100.00%acxm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEquityInstrumentOtherThanOptionsPercentageOfVesting
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member
Consecutive trading days during the performance period   20 days
Stock Appreciation Rights (SARs) | Vesting based on attainment of certain revenue targets from April 1, 2014 to March 31, 2017 | Maximum    
Share-based Activity - Other disclosures    
Price (in dollars per share)   $ 70us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VestingAxis
= acxm_PerformanceSharesVestingBasedOnAttainmentOfCertainRevenueTargetsFromApril12014ToMarch312017Member