DISCONTINUED OPERATIONS: 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, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings from discontinued operations, net of tax	$ 0	$ 1,071,661	$ 0	$ 1,158,267
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		24,677		213,512
Gross profit		(24,677)		118,673
Research and development		6,703		21,621
Sales and marketing		18,110		60,743
General and administrative		27,767		72,150
Gains, losses and other items, net		(1,658,667)		(1,656,014)
Total operating expense		(1,606,087)		(1,501,500)
Income from discontinued operations		1,581,410		1,620,173
Interest expense		0		(5,702)
Other, net		74		97
Earnings from discontinued operations before income taxes		1,581,484		1,614,568
Income taxes		509,823		456,301
Earnings from discontinued operations, net of tax		$ 1,071,661		$ 1,158,267