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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Cash Flows From Operating Activities    
Net income $ 31,483 $ 26,719
Adjustments to reconcile net income to net cash provided from operating activities:    
Depreciation and amortization 10,691 8,829
Share-based compensation 3,932 4,007
Excess income tax benefit from the exercise of stock options (3,671) (2,690)
Change in operating assets and liabilities, net of business acquisitions:    
Accounts receivable 5,916 3,512
Inventories (9,460) (12,770)
Prepaid expenses and other current assets 717 (1,699)
Accounts payable, accruals and other changes 5,580 2,104
Net Cash From Operating Activities 45,188 28,012
Cash Flows Used In Investing Activities    
Purchases of property, equipment and other non-current intangible assets (13,002) (11,145)
Proceeds from the sale of marketable securities 102,957 113,069
Purchases of marketable securities (115,117) (123,262)
Business acquisitions, net of cash acquired (34,027) (16,615)
Net Cash Used In Investing Activities (59,189) (37,953)
Cash Flows From Financing Activities    
Exercise of stock options 15,844 8,344
Excess income tax benefit from the exercise of stock options 3,671 2,690
Net Cash From Financing Activities 19,515 11,034
Effect of Exchange Rate on Cash (888) (292)
Net Increase In Cash and Cash Equivalents 4,626 801
Cash And Cash Equivalents At Beginning Of Period 55,257 66,061
Cash And Cash Equivalents At End Of Period $ 59,883 $ 66,862