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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details) (USD $)
12 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Basis of Presentation and Principles of Consolidation          
Number of years of experience of data management 45 years        
Accounts Receivable          
Unbilled amounts included in accounts receivable $ 20,900,000us-gaap_UnbilledContractsReceivable $ 20,600,000us-gaap_UnbilledContractsReceivable   $ 20,600,000us-gaap_UnbilledContractsReceivable  
Goodwill          
Impairment charge 0us-gaap_GoodwillImpairmentLoss 23,313,000us-gaap_GoodwillImpairmentLoss      
Advertising Expense          
Advertising expense 5,400,000us-gaap_AdvertisingExpense 6,000,000us-gaap_AdvertisingExpense 5,300,000us-gaap_AdvertisingExpense    
Europe Marketing and Data Services          
Goodwill          
Impairment charge       20,300,000us-gaap_GoodwillImpairmentLoss
/ acxm_ReportingUnitComponentsAxis
= acxm_EuropeMarketingAndDataServicesMember
0us-gaap_GoodwillImpairmentLoss
/ acxm_ReportingUnitComponentsAxis
= acxm_EuropeMarketingAndDataServicesMember
Impairment of Long-lived Assets and Long-lived Assets to Be Disposed Of          
Impairment charge related to other intangible assets       4,600,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ acxm_ReportingUnitComponentsAxis
= acxm_EuropeMarketingAndDataServicesMember
 
Minimum          
Basis of Presentation and Principles of Consolidation          
Investment in owned entities to be accounted using the equity method (as a percent) 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Deferred Costs and Data Acquisition Costs          
Estimated useful life of data 2 years        
Minimum | Data processing equipment          
Property and equipment and software          
Estimated useful lives 2 years        
Minimum | Office furniture and other equipment          
Property and equipment and software          
Estimated useful lives 3 years        
Minimum | Internally developed software          
Property and equipment and software          
Estimated useful lives 2 years        
Maximum          
Basis of Presentation and Principles of Consolidation          
Investment in owned entities to be accounted using the equity method (as a percent) 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Investment in owned entities to be accounted for at cost (as a percent) 20.00%acxm_CostMethodInvestmentsOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Deferred Costs and Data Acquisition Costs          
Estimated useful life of data 7 years        
Maximum | Buildings and improvements          
Property and equipment and software          
Estimated useful lives 30 years        
Maximum | Data processing equipment          
Property and equipment and software          
Estimated useful lives 5 years        
Maximum | Office furniture and other equipment          
Property and equipment and software          
Estimated useful lives 7 years        
Maximum | Internally developed software          
Property and equipment and software          
Estimated useful lives 5 years        
Maximum | Purchased software licenses          
Property and equipment and software          
Estimated useful lives 10 years        
Other services          
Goodwill          
Impairment charge   3,030,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= acxm_OtherServicesMember
  3,000,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= acxm_OtherServicesMember
 
Impairment of Long-lived Assets and Long-lived Assets to Be Disposed Of          
Impairment charge related to other intangible assets       $ 900,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= acxm_OtherServicesMember