DISCONTINUED OPERATIONS: Reconciliation of the major classes of line items constituting earnings from discontinued operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings from discontinued operations, net of tax	$ 0	$ 61,803	$ 0	$ 86,606
Acxiom Marketing Solutions | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		167,696		332,185
Costs of revenues		95,218		188,835
Gross profit		72,478		143,350
Research and development		7,352		14,918
Sales and marketing		21,106		42,633
General and administrative		27,789		44,383
Gains, losses and other items, net		1,369		2,653
Total operating expense		57,616		104,587
Income from discontinued operations		14,862		38,763
Interest expense		(2,864)		(5,702)
Other, net		(145)		23
Earnings from discontinued operations before income taxes		11,853		33,084
Income taxes		(49,950)		(53,522)
Earnings from discontinued operations, net of tax		$ 61,803		$ 86,606