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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Cash Flows From Operating Activities    
Net Income $ 43,128 $ 44,361
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 13,542 13,028
Share-based compensation 4,795 4,137
Change in operating assets and liabilities, net of business acquisitions:    
Accounts receivable 3,841 (898)
Inventories (2,238) (8,745)
Prepaid expenses and other current assets (3,119) (1,463)
Accounts payable, accruals and other changes 301 (7,455)
Net Cash From Operating Activities 60,250 42,965
Cash Flows For Investing Activities    
Purchases of property, equipment and other assets (16,322) (11,877)
Proceeds from the sale of marketable securities 300,448 290,827
Purchases of marketable securities (351,002) (316,195)
Business acquisitions, net of cash acquired (9,701) (6,388)
Net Cash For Investing Activities (76,577) (43,633)
Cash Flows From Financing Activities    
Exercise of stock options and issuance of employee stock purchase plan shares 27,915 13,752
Repurchase of common stock   (3,135)
Net Cash From Financing Activities 27,915 10,617
Effect of Exchange Rates on Cash (2,502) 553
Net Increase In Cash and Cash Equivalents 9,086 10,502
Cash and Cash Equivalents, Beginning of Period 41,688 83,074
Cash and Cash Equivalents, End of Period $ 50,774 $ 93,576