ACQUISITIONS: Purchase price allocation related to assets acquired and liabilities assumed (Details) € in Thousands, $ in Thousands					12 Months Ended
	Jul. 02, 2019 USD ($)	Jul. 02, 2019 EUR (€)	Apr. 02, 2019 USD ($)	Feb. 14, 2018 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill					$ 297,796	$ 204,656	$ 203,639
Net cash paid					$ 105,365	$ 0	$ 4,478
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
Funds held in escrow	(14,815)
Cash acquired	(438)
Net purchase price allocated	118,001
Fair value of replacement stock options considered a component of purchase price	(2,300)
Net cash paid	$ 100,886	€ 100,886
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
Cash acquired			(35)
Net cash paid			$ 4,479
Pacific Data Partners LLC
Business Acquisition [Line Items]
Cash				$ 228
Trade accounts receivable				224
Goodwill				3,260
Total assets acquired				5,912
Accounts payable and accrued expenses				(706)
Net assets acquired				5,206
Funds held in escrow				(500)
Cash acquired				(228)
Intangible assets				2,200
Net cash paid				$ 4,478