DISCONTINUED OPERATIONS: Reconciliation of the major classes of line items constituting earnings from discontinued operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income taxes	$ 0	$ 207	$ 470,346
Earnings from discontinued operations, net of tax	$ 0	750	1,162,494
Acxiom Marketing Solutions | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		0	332,185
Costs of revenues		0	213,512
Gross profit		0	118,673
Research and development		0	21,621
Sales and marketing		0	60,743
General and administrative		0	71,500
Gains, losses and other items, net		(957)	(1,673,636)
Total operating expense		(957)	(1,519,772)
Income from discontinued operations		957	1,638,445
Interest expense		0	(5,702)
Other, net		0	97
Earnings from discontinued operations before income taxes		957	1,632,840
Income taxes		207	470,346
Earnings from discontinued operations, net of tax		$ 750	$ 1,162,494