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STOCK-BASED COMPENSATION: - Acquisition-related Consideration Holdback (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
DataFleets, Ltd
Share-based compensation
Holdback expenses	$ 2.3
Holdback expenses, expected costs	6.0
DataFleets, Ltd | Accrued Liabilities
Share-based compensation
Holdback expenses	2.3
Data Plus Math Corporation
Share-based compensation
Holdback expenses		$ 16.2
Holdback expenses, expected costs	$ 8.1
Data Plus Math Corporation | Accrued Liabilities
Share-based compensation
Holdback expenses		$ 0.0

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