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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Cash Flows From Operating Activities      
Net Income $ 33,576 $ 28,031 $ 27,041
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 10,649 9,180 7,411
Deferred income taxes 496 (542) 287
Share based compensation 4,450 3,686 3,064
Excess income tax benefit from the exercise of stock options (2,475) (4,757) (3,113)
Changes in operating assets and liabilities, net of business acquisitions:      
Accounts receivable (7,252) (10,602) (2,674)
Inventories 319 (3,529) (2,082)
Prepaid expenses and other current assets 3,264 (2,654) (1,505)
Accounts payable 412 1,970 (1,417)
Accruals and other changes 353 885 (451)
Net Cash From Operating Activities 43,792 21,668 26,561
Cash Flows For Investing Activities      
Purchases of property, equipment and other noncurrent assets (9,619) (11,543) (8,897)
Proceeds from the sale of marketable securities 93,662 91,207 67,039
Purchases of marketable securities (105,944) (91,691) (82,776)
Business acquisitions, net of cash acquired (6,554) (39,265) (13,318)
Net Cash For Investing Activities (28,455) (51,292) (37,952)
Cash Flows From Financing Activities      
Exercise of stock options 8,558 14,851 9,533
Excess income tax benefit from the exercise of stock options 2,475 4,757 3,113
Decrease in other long-term liabilities 0 0 (155)
Net Cash From Financing Activities 11,033 19,608 12,491
Effect of Exchange Rate on Cash (984) 659 (113)
Net Increase (Decrease) In Cash and Cash Equivalents 25,386 (9,357) 987
Cash And Cash Equivalents At Beginning of Year 40,675 50,032 49,045
Cash And Cash Equivalents At End of Year 66,061 40,675 50,032
Supplementary Cash Flow Information      
Income taxes paid, net of refunds $ 10,454 $ 9,956 $ 8,986