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DISCONTINUED OPERATIONS AND DISPOSITIONS: - Reconciliation of the major classes of line items constituting earnings from discontinued operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Discontinued operations
Income taxes									$ 470,346	$ 42,952	$ 49,718
Earnings from discontinued operations, net of tax	$ 4,227	$ 1,071,661	$ 61,803	$ 24,803	$ 24,185	$ 19,824	$ 21,855	$ 24,915	1,162,494	90,779	89,684
Acxiom Marketing Solutions | Discontinued operations, held-for-sale or disposed of by sale
Discontinued operations
Revenues									332,185	697,305	705,487
Cost of revenue									213,512	370,040	377,710
Gross profit									118,673	327,265	327,777
Research and development									21,621	34,160	32,742
Sales and marketing									60,743	106,960	107,418
General and administrative									71,500	38,372	36,816
Gain on sale of discontinued operations									(1,673,636)	3,650	3,700
Total operating expenses									(1,519,772)	183,142	180,676
Earnings from discontinued operations									1,638,445	144,123	147,101
Interest expense									(5,702)	(10,131)	(7,381)
Other, net									97	(261)	(318)
Earnings from discontinued operations before income taxes									1,632,840	133,731	139,402
Income taxes									470,346	42,952	49,718
Earnings from discontinued operations, net of tax									$ 1,162,494	$ 90,779	$ 89,684

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