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Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Cash Flows From Operating Activities    
Net income $ 45,122,000 $ 43,128,000
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 15,107,000 13,542,000
Share-based compensation 4,773,000 4,795,000
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable 1,019,000 3,841,000
Inventories 3,328,000 (2,238,000)
Prepaid expenses and other current assets (1,908,000) (3,119,000)
Accounts payable, accruals and other changes (8,321,000) 301,000
Net Cash From Operating Activities 59,120,000 60,250,000
Cash Flows For Investing Activities    
Purchases of property, equipment and other non-current intangible assets (19,393,000) (16,322,000)
Proceeds from the sales of marketable securities 602,233,000 300,448,000
Purchase of marketable securities (604,694,000) (351,002,000)
Business acquisitions, net of cash acquired (52,000,000) (9,701,000)
Net Cash For Investing Activities (73,854,000) (76,577,000)
Cash Flows From Financing Activities    
Exercise of stock options and issuance of employee stock purchase plan shares 22,801,000 27,915,000
Net Cash From Financing Activities 22,801,000 27,915,000
Effect of Foreign Exchange Rate on Cash (854,000) (2,502,000)
Net Increase In Cash and Cash Equivalents 7,213,000 9,086,000
Cash and Cash Equivalents, Beginning of Period 66,269,000 41,688,000
Cash and Cash Equivalents, End of Period $ 73,482,000 $ 50,774,000