Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Cash Flows From Operating Activities
Net Income	$ 14,652	$ 15,237
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	4,435	4,271
Share-based compensation	1,543	1,431
Change in operating assets and liabilities, net of business acquisitions:
Accounts receivable	3,390	755
Inventories	(2,132)	(2,940)
Prepaid expenses and other current assets	(1,929)	(3,236)
Accounts payable, accruals and other changes	3,760	564
Net Cash From Operating Activities	23,719	16,082
Cash Flows For Investing Activities
Purchases of property, equipment and other assets	(6,469)	(1,918)
Proceeds from the sale of marketable securities	94,540	73,096
Purchases of marketable securities	(103,432)	(74,549)
Business acquisitions, net of cash acquired	0	(4,203)
Net Cash For Investing Activities	(15,361)	(7,574)
Cash Flows From Financing Activities
Exercise of stock options and issuance of employee stock purchase plan shares	8,708	8,992
Net Cash From Financing Activities	8,708	8,992
Effect of Exchange Rates on Cash	(2,465)	(3,349)
Net Increase In Cash and Cash Equivalents	14,601	14,151
Cash and Cash Equivalents, Beginning of Period	41,688	83,074
Cash and Cash Equivalents, End of Period	$ 56,289	$ 97,225