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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Cash Flows From Operating Activities    
Net Income $ 27,905,000 $ 31,745,000
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 11,511,000 9,523,000
Share-based compensation 3,438,000 3,192,000
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable (1,500,000) 6,662,000
Inventories (6,929,000) 4,063,000
Prepaid expenses and other current assets (3,709,000) (2,080,000)
Accounts payable, accruals and other changes 10,341,000 (5,581,000)
Net Cash From Operating Activities 41,057,000 47,524,000
Cash Flows Used for Investing Activities    
Purchase of property, equipment and other non-current intangible assets (5,235,000) (11,092,000)
Proceeds from the sale of marketable securities 197,941,000 309,030,000
Purchase of marketable securities (230,586,000) (308,524,000)
Business acquisitions, net of cash acquired (26,864,000) (2,350,000)
Net Cash For Investing Activities (64,744,000) (12,936,000)
Cash Flows From Financing Activities    
Exercise of stock options and issuance of employee stock purchase plan shares 6,619,000 12,658,000
Net Cash From Financing Activities 6,619,000 12,658,000
Effects of Foreign Exchange Rates on Cash (7,415,000) 352,000
Net Increase (Decrease) in Cash and Cash Equivalents (24,483,000) 47,598,000
Cash and Cash Equivalents, Beginning of period 75,602,000 66,269,000
Cash and Cash Equivalents, End of period $ 51,119,000 $ 113,867,000