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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Cash Flows From Operating Activities    
Net Income $ 44,361 $ 45,670
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 13,028 12,682
Share-based compensation 4,137 3,692
Change in operating assets and liabilities, net of business acquisitions:    
Accounts receivable (898) (4,013)
Inventories (8,745) (3,859)
Prepaid expenses and other current assets (1,463) (7,316)
Accounts payable, accruals and other changes (7,455) (280)
Net Cash From Operating Activities 42,965 46,576
Cash Flows From Investing Activities    
Purchases of property, equipment and other non-current intangible assets (11,877) (16,297)
Proceeds from the sale of marketable securities 290,827 211,327
Purchases of marketable securities (316,195) (255,348)
Business acquisitions, net of cash acquired (6,388) (468)
Net Cash Used In Investing Activities (43,633) (60,786)
Cash Flows From Financing Activities    
Exercise of stock options and issuance of employee stock purchase plan shares 13,752 18,916
Repurchase of common stock (3,135) 0
Net Cash From Financing Activities 10,617 18,916
Effect of Exchange Rate on Cash 553 (207)
Net Increase In Cash and Cash Equivalents 10,502 4,499
Cash and Cash Equivalents, Beginning of Period 83,074 77,567
Cash and Cash Equivalents, End of Period $ 93,576 $ 82,066