Document and Entity Information - shares	6 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document and Entity Information
Entity Registrant Name	ACXIOM CORP
Entity Central Index Key	0000733269
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		79,136,883
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2