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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Cash Flows From Operating Activities    
Net Income $ 9,934 $ 9,289
Adjustments to reconcile net income to net cash provided from operating activities:    
Depreciation and amortization 3,476 2,704
Share based compensation 1,516 1,297
Excess income tax benefit from the exercise of stock options (728) (1,880)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable 7,684 1,209
Inventories (5,910) (3,310)
Prepaid expenses and other current assets 42 (2,725)
Accounts payable, accruals and other changes 4,262 16
Net Cash From Operating Activities 20,276 6,600
Cash Flows Used In Investing Activities    
Purchases of property, equipment and other non-current intangible assets (3,446) (2,821)
Proceeds from the sale of marketable securities 28,116 28,648
Purchases of marketable securities (28,616) (49,174)
Business acquisitions, net of cash required 0 (13,126)
Net Cash Used In Investing Activities (3,946) (36,473)
Cash Flows From Financing Activities    
Exercise of stock options 4,053 4,293
Excess income tax benefit from the exercise of stock options 728 1,880
Net Cash From Financing Activities 4,781 6,173
Effect Of Exchange Rate On Cash (181) (35)
Net Increase (Decrease) In Cash And Cash Equivalents 20,930 (23,735)
Cash And Cash Equivalents At Beginning Of Period 55,257 66,061
Cash And Cash Equivalents At End Of Period $ 76,187 $ 42,326