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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Cash Flows From Operating Activities    
Net Income $ 30,928 $ 31,288
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 8,985 8,597
Share-based compensation 3,155 2,831
Change in operating assets and liabilities, net of business acquisitions:    
Accounts receivable (2,483) (3,615)
Inventories (103) (3,787)
Prepaid expenses and other current assets (1,323) (2,025)
Accounts payable, accruals and other changes 1,313 (706)
Net Cash From Operating Activities 40,472 32,583
Cash Flows For Investing Activities    
Purchases of property, equipment and other assets (12,806) (6,720)
Proceeds from the sale of marketable securities 199,708 179,839
Purchases of marketable securities (220,528) (191,488)
Business acquisitions, net of cash acquired   (4,903)
Net Cash For Investing Activities (33,626) (23,272)
Cash Flows From Financing Activities    
Exercise of stock options and issuance of employee stock purchase plan shares 19,213 10,268
Net Cash From Financing Activities 19,213 10,268
Effect of Exchange Rates on Cash (1,333) (1,068)
Net Increase In Cash and Cash Equivalents 24,726 18,511
Cash and Cash Equivalents, Beginning of Period 41,688 83,074
Cash and Cash Equivalents, End of Period $ 66,414 $ 101,585