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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Cash Flows From Operating Activities      
Net Income $ 60,176 $ 63,215 $ 43,973
Adjustments to reconcile net income to net cash from operating activities:      
Depreciation and amortization 17,624 17,058 14,691
Deferred income taxes 1,197 (2,996) (292)
Share-based compensation 5,543 4,909 5,261
Excess income tax benefit from exercise of stock options     (3,922)
Changes in operating assets and liabilities, net of business acquisitions:      
Accounts receivable (4,025) (10,233) 5,035
Inventories (10,437) (2,647) (6,970)
Prepaid expenses and other assets (3,569) (2,275) 812
Accounts payable (1,461) 4,381 (1,691)
Accruals and other changes (1,206) (2,281) 3,377
Net Cash From Operating Activities 63,842 69,131 60,274
Cash Flows Used in Investing Activities      
Purchase of property, equipment and other non-current intangible assets (14,661) (20,946) (14,578)
Proceeds from the sales of marketable securities 339,225 299,751 149,226
Purchase of marketable securities (437,324) (361,419) (162,755)
Business acquisitions, net of cash acquired (6,388) (468) (34,029)
Net Cash Used In Investing Activities (119,148) (83,082) (62,136)
Cash Flows From Financing Activities      
Exercise of stock options and other 17,034 23,261 21,148
Repurchase of common stock (3,135)    
Excess income tax benefit from the exercise of stock options     3,922
Purchase of non-controlling minority interest   (423)  
Net Cash From Financing Activities 13,899 22,838 25,070
Effect of Exchange Rate on Cash 21 (3,380) (898)
Net (Decrease) Increase in Cash and Cash Equivalents (41,386) 5,507 22,310
Cash and Cash Equivalents, Beginning of Year 83,074 77,567 55,257
Cash and Cash Equivalents, End of Year 41,688 83,074 77,567
Supplementary Cash Flow Information      
Income taxes paid, net of refunds $ 13,027 $ 14,966 $ 17,704