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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Cash Flows From Operating Activities    
Net Income $ 45,670 $ 31,483
Adjustments to reconcile net income to net cash provided from operating activities:    
Depreciation and amortization 12,682 10,691
Share-based compensation 3,692 3,932
Excess income tax benefit from the exercise of stock options (see note 5)   (3,671)
Change in operating assets and liabilities, net of business acquisitions:    
Accounts receivable (4,013) 5,916
Inventories (3,859) (9,460)
Prepaid expenses and other current assets (7,316) 717
Accounts payable, accruals and other changes (280) 5,580
Net Cash Provided By Operating Activities 46,576 45,188
Cash Flows Used In Investing Activities    
Purchases of property, equipment and other non-current intangible assets (16,297) (13,002)
Proceeds from the sale of marketable securities 211,327 102,957
Purchases of marketable securities (255,348) (115,117)
Business acquisitions, net of cash acquired (468) (34,027)
Net Cash Used In Investing Activities (60,786) (59,189)
Cash Flows From Financing Activities    
Exercise of stock options 18,916 15,844
Excess income tax benefit from the exercise of stock options   3,671
Net Cash Provided By Financing Activities 18,916 19,515
Effect of Exchange Rates on Cash (207) (888)
Net Increase In Cash and Cash Equivalents 4,499 4,626
Cash And Cash Equivalents At Beginning Of Period 77,567 55,257
Cash And Cash Equivalents At End Of Period $ 82,066 $ 59,883