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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Net income $ 28,031 $ 27,041 $ 22,389
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 9,180 7,411 6,173
Deferred income taxes (542) 287 1,340
Share based compensation 3,686 3,064 2,455
Excess income tax benefit from the exercise of stock options (4,757) (3,113) (1,829)
Changes in operating assets and liabilities, net of business acquisitions:      
Accounts receivable (10,602) (2,674) (7,204)
Inventories (3,529) (2,082) (3,093)
Prepaid expenses and other current assets (2,654) (1,505) 1,497
Accounts payable 1,970 (1,417) 2,330
Accruals and other changes 885 (451) (1,781)
Net Cash From Operating Activities 21,668 26,561 22,277
Cash Flows Used In Investing Activities      
Purchases of property, equipment and other noncurrent assets (11,543) (8,897) (12,413)
Proceeds from the sale of marketable securities 91,207 67,039 72,270
Purchases of marketable securities (91,691) (82,776) (71,631)
Business acquisitions, net of cash acquired (39,265) (13,318) (4,011)
Net Cash Used In Investing Activities (51,292) (37,952) (15,785)
Cash Flows From Financing Activities      
Exercise of stock options 14,851 9,533 5,797
Excess income tax benefit from the exercise of stock options 4,757 3,113 1,829
Decrease in other long-term liabilities 0 (155) (750)
Net Cash From Financing Activities 19,608 12,491 6,876
Effect of Exchange Rate on Cash 659 (113) (167)
Net Increase (Decrease) In Cash and Cash Equivalents (9,357) 987 13,201
Cash And Cash Equivalents At Beginning of Year 50,032 49,045 35,844
Cash And Cash Equivalents At End of Year 40,675 50,032 49,045
Supplementary Cash Flow Information      
Income taxes paid, net of refunds $ 9,956 $ 8,986 $ 6,445