TOPIC 606 ADOPTION IMPACT AND REVENUE FROM CONTRACTS WITH CUSTOMERS: Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 226,960	$ 212,514
United States
Disaggregation of Revenue [Line Items]
Revenues	206,529	194,247
Europe
Disaggregation of Revenue [Line Items]
Revenues	16,023	14,537
APAC
Disaggregation of Revenue [Line Items]
Revenues	4,408	3,730
Audience Creation
Disaggregation of Revenue [Line Items]
Revenues	45,452	51,303
Data Analytics
Disaggregation of Revenue [Line Items]
Revenues	9,025	8,858
Data Management
Disaggregation of Revenue [Line Items]
Revenues	110,025	105,596
Subscription
Disaggregation of Revenue [Line Items]
Revenues	51,329	37,052
Marketplace and Other
Disaggregation of Revenue [Line Items]
Revenues	11,129	9,705
Acxiom Marketing Solutions
Disaggregation of Revenue [Line Items]
Revenues	164,502	165,757
Acxiom Marketing Solutions | United States
Disaggregation of Revenue [Line Items]
Revenues	150,307	152,129
Acxiom Marketing Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenues	11,115	10,735
Acxiom Marketing Solutions | APAC
Disaggregation of Revenue [Line Items]
Revenues	3,080	2,893
Acxiom Marketing Solutions | Audience Creation
Disaggregation of Revenue [Line Items]
Revenues	45,452	51,303
Acxiom Marketing Solutions | Data Analytics
Disaggregation of Revenue [Line Items]
Revenues	9,025	8,858
Acxiom Marketing Solutions | Data Management
Disaggregation of Revenue [Line Items]
Revenues	110,025	105,596
Acxiom Marketing Solutions | Subscription
Disaggregation of Revenue [Line Items]
Revenues	0	0
Acxiom Marketing Solutions | Marketplace and Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
LiveRamp
Disaggregation of Revenue [Line Items]
Revenues	62,458	46,757
LiveRamp | United States
Disaggregation of Revenue [Line Items]
Revenues	56,222	42,118
LiveRamp | Europe
Disaggregation of Revenue [Line Items]
Revenues	4,908	3,802
LiveRamp | APAC
Disaggregation of Revenue [Line Items]
Revenues	1,328	837
LiveRamp | Audience Creation
Disaggregation of Revenue [Line Items]
Revenues	0	0
LiveRamp | Data Analytics
Disaggregation of Revenue [Line Items]
Revenues	0	0
LiveRamp | Data Management
Disaggregation of Revenue [Line Items]
Revenues	0	0
LiveRamp | Subscription
Disaggregation of Revenue [Line Items]
Revenues	51,329	37,052
LiveRamp | Marketplace and Other
Disaggregation of Revenue [Line Items]
Revenues	$ 11,129	$ 9,705