ACQUISITIONS: Purchase price allocation related to assets acquired and liabilities assumed (Details) € in Thousands, $ in Thousands				9 Months Ended
	Jul. 02, 2019 USD ($)	Jul. 02, 2019 EUR (€)	Apr. 02, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 297,780		$ 204,656
Net cash paid				$ 105,365	$ 0
Data Plus Math Corporation
Business Acquisition [Line Items]
Cash	$ 438
Trade accounts receivable	957
Goodwill	89,942
Intangible assets (Other assets)	35,000
Other current and noncurrent assets	1,186
Total assets acquired	127,523
Deferred income taxes	(6,357)
Accounts payable and accrued expenses	(2,727)
Net assets acquired	118,439
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	€ 115,701
Faktor B. V.
Business Acquisition [Line Items]
Cash			$ 35
Trade accounts receivable			63
Goodwill			3,110
Intangible assets (Other 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