ACQUISITIONS: Purchase Price Allocation Related to Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands						12 Months Ended
	Apr. 21, 2021	Feb. 17, 2021	Jul. 16, 2020	Jul. 02, 2019	Apr. 02, 2019	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Business Acquisition [Line Items]
Goodwill						$ 363,845	$ 357,446	$ 297,796
Net cash paid						$ 19,107	$ 76,012	$ 105,365
Diablo.AI, Inc.
Business Acquisition [Line Items]
Cash	$ 131
Goodwill	7,012
Intangible assets	3,500
Total assets acquired	10,643
Deferred income taxes	(710)
Accounts payable and accrued expenses	(65)
Net assets acquired	9,868
Net cash paid	8,537
Cash acquired	(131)
Cash held back	(1,200)
Fair value of replacement stock options considered a component of purchase price	(1,900)
Net purchase price allocated	$ 9,737
DataFleets, Ltd
Business Acquisition [Line Items]
Cash		$ 2,099
Goodwill		56,436
Intangible assets		11,400
Other current and noncurrent assets		1,119
Total assets acquired		71,054
Deferred income taxes		(1,716)
Accounts payable and accrued expenses		(75)
Net assets acquired		69,263
Net cash paid		58,264
Cash acquired		(2,099)
Cash held back		(8,900)
Restricted cash held in escrow		(8,900)
Net purchase price allocated		$ 67,164
Acuity Data
Business Acquisition [Line Items]
Cash			$ 184
Trade accounts receivable			156
Goodwill			2,011
Intangible assets			1,100
Other current and noncurrent assets			43
Total assets acquired			3,494
Deferred income taxes			(288)
Accounts payable and accrued expenses			(89)
Net assets acquired			3,117
Net cash paid			2,933
Cash acquired			$ (184)
Data Plus Math Corporation
Business Acquisition [Line Items]
Cash				$ 438
Trade accounts receivable				957
Goodwill				90,619
Intangible assets				34,000
Other current and noncurrent assets				1,186
Total assets acquired				127,200
Deferred income taxes				(6,034)
Accounts payable and accrued expenses				(2,727)
Net assets acquired				118,439
Net cash paid				100,886
Cash acquired				(438)
Restricted cash held in escrow				(14,815)
Fair value of replacement stock options considered a component of purchase price				(2,300)
Net purchase price allocated				$ 118,001
Faktor B.V.
Business Acquisition [Line Items]
Cash					$ 35
Trade accounts receivable					63
Goodwill					3,110
Intangible assets					1,700
Other current and noncurrent assets					126
Total assets acquired					5,034
Deferred income taxes					(194)
Accounts payable and accrued expenses					(326)
Net assets acquired					4,514
Net cash paid					4,479
Cash acquired					$ (35)