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SOFTWARE AND RESEARCH AND DEVELOPMENT COSTS: (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2015
Software        
Research and development costs $ 20.3us-gaap_ResearchAndDevelopmentExpense $ 23.6us-gaap_ResearchAndDevelopmentExpense $ 11.7us-gaap_ResearchAndDevelopmentExpense  
LiveRamp Inc        
Software        
Capitalized Computer Software, Amortization 4.3us-gaap_CapitalizedComputerSoftwareAmortization
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
    4.3us-gaap_CapitalizedComputerSoftwareAmortization
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
Internally developed software        
Software        
Amortization expense 29.0us-gaap_CostOfGoodsAndServicesSoldAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
9.7us-gaap_CostOfGoodsAndServicesSoldAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
8.6us-gaap_CostOfGoodsAndServicesSoldAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
 
Internally developed software | LiveRamp Inc        
Software        
Amortization expense 7.5us-gaap_CostOfGoodsAndServicesSoldAmortization
/ us-gaap_BusinessAcquisitionAxis
= acxm_LiverampIncMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
     
Purchased software licenses        
Software        
Amortization expense $ 6.7us-gaap_CostOfGoodsAndServicesSoldAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= acxm_PurchasedSoftwareLicensesMember
$ 7.1us-gaap_CostOfGoodsAndServicesSoldAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= acxm_PurchasedSoftwareLicensesMember
$ 9.7us-gaap_CostOfGoodsAndServicesSoldAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= acxm_PurchasedSoftwareLicensesMember