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STOCKHOLDERS' EQUITY: - Stock-based compensation activity, by award type (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Share-based compensation
Total non-cash stock-based compensation	$ 111,707	$ 89,447	$ 102,722
Total non-cash stock-based compensation included in the consolidated statements of equity	84,396	65,219	151,344
Stock options
Share-based compensation
Share-based compensation expense	2,308	3,675	3,291
Restricted stock units
Share-based compensation
Share-based compensation expense	78,164	55,543	67,015
Arbor Holdback Agreement | Arbor
Share-based compensation
Share-based compensation expense	0	2,553	15,316
Consideration Holdback | Data Plus Math Corporation
Share-based compensation
Share-based compensation expense	8,030	6,185	0
Consideration Holdback | DataFleets, Ltd
Share-based compensation
Share-based compensation expense	755	0	0
Pacific Data Partners, LLC Agreement Plan | Pacific Data Partners LLC
Share-based compensation
Share-based compensation expense	18,388	20,332	15,758
Acuity Performance Earnout | Acuity Data
Share-based compensation
Share-based compensation expense	2,208	0	0
Liability-based equity awards
Share-based compensation
Total non-cash stock-based compensation	(27,311)	(24,228)	(14,239)
Other stock-based compensation
Share-based compensation
Share-based compensation expense	$ 1,854	$ 1,159	$ 1,342

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