DISCONTINUED OPERATIONS: Narrative (Details) $ in Millions	6 Months Ended
	Sep. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incremental increase to previous periods	$ 10.2
Acxiom Marketing Solutions | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from disposal of operations	$ 2,300.0