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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Cash Flows From Operating Activities    
Net income $ 11,936 $ 9,934
Adjustments to reconcile net income to net cash provided from operating activities:    
Depreciation and amortization 3,993 3,476
Share-based compensation 1,401 1,516
Excess income tax benefit from the exercise of stock options (see note 5)   (728)
Change in operating assets and liabilities:    
Accounts receivable 2,227 7,684
Inventories (276) (5,910)
Prepaid expenses and other current assets (3,590) 42
Accounts payable, accruals and other changes 2,980 4,262
Net Cash From Operating Activities 18,671 20,276
Cash Flows Used In Investing Activities    
Purchases of property, equipment and other non-current intangible assets (4,415) (3,446)
Proceeds from the sale of marketable securities 44,502 28,116
Purchases of marketable securities (79,968) (28,616)
Net Cash Used In Investing Activities (39,881) (3,946)
Cash Flows From Financing Activities    
Exercise of stock options 1,956 4,053
Excess income tax benefit from the exercise of stock options (see note 5)   728
Net Cash From Financing Activities 1,956 4,781
Effect of Exchange Rate on Cash 143 (181)
Net Increase In Cash and Cash Equivalents (19,111) 20,930
Cash And Cash Equivalents At Beginning Of Period 77,567 55,257
Cash And Cash Equivalents At End Of Period $ 58,456 $ 76,187