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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Cash Flows From Operating Activities
Net income	$ 60,882	$ 59,475	$ 60,176
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	21,041	18,396	17,624
Deferred income taxes	(640)	1,601	1,197
Share-based compensation	6,437	6,468	5,543
Changes in operating assets and liabilities, net of business acquisitions:
Accounts receivable	(2,595)	(2,881)	(4,025)
Inventories	2,450	(10,011)	(10,437)
Prepaid expenses and other assets	(3,386)	(1,017)	(3,569)
Accounts payable	(3,206)	6,745	(1,461)
Accruals and other changes	106	7,102	(1,206)
Net Cash From Operating Activities	81,089	85,878	63,842
Cash Flows Used for Investing Activities
Purchase of property, equipment and other non-current intangible assets	(26,712)	(24,052)	(14,661)
Proceeds from the maturities of marketable securities	764,597	406,731	339,225
Purchase of marketable securities	(792,678)	(458,300)	(437,324)
Business acquisitions, net of cash acquired	(50,771)	(13,164)	(6,388)
Net Cash Used for Investing Activities	(105,564)	(88,785)	(119,148)
Cash Flows From Financing Activities
Exercise of stock options and other	34,631	29,405	17,034
Payment of contingent consideration	(1,087)
Repurchase of common stock			(3,135)
Net Cash From Financing Activities	33,544	29,405	13,899
Effects of Foreign Exchange Rate on Cash	264	(1,917)	21
Net Increase (Decrease) in Cash and Cash Equivalents	9,333	24,581	(41,386)
Cash and Cash Equivalents, Beginning of Year	66,269	41,688	83,074
Cash and Cash Equivalents, End of Year	75,602	66,269	41,688
Supplementary Cash Flow Information
Income taxes paid, net of refunds	$ 14,966	$ 7,364	$ 13,027

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