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DISCONTINUED OPERATIONS AND DISPOSITIONS: - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Oct. 01, 2018	Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2017
Proceeds from Divestiture of Businesses, Net of Cash Divested [Abstract]
Incremental revenues			$ 9.0
Acxiom Marketing Solutions | Discontinued Operations, Disposed of by Sale
Proceeds from Divestiture of Businesses, Net of Cash Divested [Abstract]
Proceeds from divestiture of businesses	$ 2,300.0
Adjustments and transaction costs	49.0
Repayments of debt	230.5
Gain (loss) on disposal of discontinued operation	$ 1,700.0	$ 17.6
Zeta Interactive | Sale to Zeta
Proceeds from Divestiture of Businesses, Net of Cash Divested [Abstract]
Proceeds from divestiture of businesses				$ 22.0
Subordinated promissory note				$ 4.0
Interest rate, stated percentage				6.00%
Gain (loss) on disposition of business			0.3
Income tax benefit			$ 4.3

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