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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Cash Flows From Operating Activities      
Net Income $ 36,538 $ 33,576 $ 28,031
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 12,540 10,649 9,180
Deferred income taxes 1,906 496 (542)
Share based compensation 5,468 4,450 3,686
Excess income tax benefit from the exercise of stock options (2,945) (2,475) (4,757)
Changes in operating assets and liabilities, net of business acquisitions:      
Accounts receivable (6,002) (7,252) (10,602)
Inventories (9,427) 319 (3,529)
Prepaid expenses and other current assets (3,836) 3,264 (2,654)
Accounts payable 704 412 1,970
Accruals and other changes 385 353 885
Net Cash From Operating Activities 35,331 43,792 21,668
Cash Flows Used In Investing Activities      
Purchases of property, equipment and other non-current intangible assets (14,222) (9,619) (11,543)
Proceeds from the sale of marketable securities 147,189 93,662 91,207
Purchases of marketable securities (151,625) (105,944) (91,691)
Business acquisitions, net of cash acquired (42,491) (6,554) (39,265)
Net Cash Used In Investing Activities (61,149) (28,455) (51,292)
Cash Flows From Financing Activities      
Exercise of stock options 12,363 8,558 14,851
Excess income tax benefit from the exercise of stock options 2,945 2,475 4,757
Net Cash From Financing Activities 15,308 11,033 19,608
Effect of Exchange Rate on Cash (294) (984) 659
Net Increase (Decrease) In Cash and Cash Equivalents (10,804) 25,386 (9,357)
Cash And Cash Equivalents At Beginning of Year 66,061 40,675 50,032
Cash And Cash Equivalents At End of Year 55,257 66,061 40,675
Supplementary Cash Flow Information      
Income taxes paid, net of refunds $ 13,413 $ 10,454 $ 9,956