DISPOSITION: Reconciliation of the major classes of line items constituting earnings from discontinued operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings from discontinued operations, net of tax	$ 1,071,661	$ 20,407	$ 1,158,267	$ 68,851
Acxiom Marketing Solutions | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	0	175,750	332,185	512,734
Costs of revenues	24,677	91,394	213,512	272,356
Gross profit	(24,677)	84,356	118,673	240,378
Research and development	6,703	9,007	21,621	26,144
Sales and marketing	18,110	25,898	60,743	74,384
General and administrative	27,767	9,957	72,150	26,926
Gains, losses and other items, net	(1,658,667)	747	(1,656,014)	1,479
Total operating expense	(1,606,087)	45,609	(1,501,500)	128,933
Income from discontinued operations	1,581,410	38,747	1,620,173	111,445
Interest expense	0	(2,566)	(5,702)	(7,432)
Other, net	74	(13)	97	(176)
Earnings from discontinued operations before income taxes	1,581,484	36,168	1,614,568	103,837
Income taxes	509,823	15,761	456,301	34,986
Earnings from discontinued operations, net of tax	$ 1,071,661	$ 20,407	$ 1,158,267	$ 68,851