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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Cash Flows From Operating Activities      
Net income $ 63,215 $ 43,973 $ 36,538
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 17,058 14,691 12,181
Deferred income taxes (2,996) (292) 1,906
Share-based compensation 4,909 5,261 5,468
Excess income tax benefit from exercise of stock options   (3,922) (2,945)
Changes in operating assets and liabilities, net of business acquisitions:      
Accounts receivable (10,233) 5,035 (6,002)
Inventories (2,647) (6,970) (9,427)
Prepaid expenses and other assets (2,275) 812 (3,836)
Accounts payable 4,381 (1,691) 704
Accruals and other changes (2,281) 3,377 744
Net Cash From Operating Activities 69,131 60,274 35,331
Cash Flows Used in Investing Activities      
Purchase of property, equipment and other non-current intangible assets (20,946) (14,578) (14,222)
Proceeds from the sales of marketable securities 299,751 149,226 147,189
Purchase of marketable securities (361,419) (162,755) (151,625)
Business acquisitions, net of cash acquired (468) (34,029) (42,491)
Net Cash Used in Investing Activities (83,082) (62,136) (61,149)
Cash Flows From Financing Activities      
Exercise of stock options and other 23,261 21,148 12,363
Excess income tax benefit from the exercise of stock options   3,922 2,945
Purchase of minority interest (423)    
Net Cash From Financing Activities 22,838 25,070 15,308
Effect of Exchange Rate on Cash (3,380) (898) (294)
Net Increase (Decrease) in Cash and Cash Equivalents 5,507 22,310 (10,804)
Cash and Cash Equivalents, Beginning of Year 77,567 55,257 66,061
Cash and Cash Equivalents, End of Year 83,074 77,567 55,257
Supplementary Cash Flow Information      
Income taxes paid, net of refunds $ 11,800 $ 13,865 $ 13,413