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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Cash Flows From Operating Activities    
Net Income $ 15,237 $ 11,936
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 4,271 3,993
Share-based compensation 1,431 1,401
Change in operating assets and liabilities, net of business acquisitions:    
Accounts receivable 755 2,227
Inventories (2,940) (276)
Prepaid expenses and other current assets (3,236) (3,590)
Accounts payable, accruals and other changes 564 2,980
Net Cash From Operating Activities 16,082 18,671
Cash Flows From Investing Activities    
Purchases of property, equipment and other non-current intangible assets (1,918) (4,415)
Proceeds from the sale of marketable securities 73,096 44,502
Purchases of marketable securities (74,549) (79,968)
Business acquisitions, net of cash acquired (4,203)  
Net Cash From Investing Activities (7,574) (39,881)
Cash Flows From Financing Activities    
Exercise of stock options and issuance of employee stock purchase plan shares 8,992 1,956
Net Cash From Financing Activities 8,992 1,956
Effect of Exchange Rate on Cash (3,349) 143
Net Increase (decrease) In Cash and Cash Equivalents 14,151 (19,111)
Cash and Cash Equivalents, Beginning of Period 83,074 77,567
Cash and Cash Equivalents, End of Period $ 97,225 $ 58,456