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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Net income $ 27,041 $ 22,389 $ 22,795
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 7,411 6,173 5,329
Deferred income taxes 287 1,340 2,253
Share based compensation 3,064 2,455 2,237
Excess income tax benefit from the exercise of stock options (3,113) (1,829) (2,992)
Changes in operating assets and liabilities, net of business acquisitions:      
Accounts receivable (2,674) (7,204) (903)
Inventories (2,082) (3,093) (434)
Prepaid expenses and other current assets (1,505) 1,497 499
Accounts payable (1,417) 2,330 1,196
Accruals and other changes (451) (1,781) (1,137)
Net Cash From Operating Activities 26,561 22,277 28,843
Cash Flows Used In Investing Activities      
Purchases of property, equipment and other noncurrent assets (8,897) (12,413) (7,796)
Proceeds from the sale of marketable securities 67,039 72,270 40,076
Purchases of marketable securities (82,776) (71,631) (60,315)
Business acquisitions, net of cash acquired (13,318) (4,011) 0
Net Cash Used In Investing Activities (37,952) (15,785) (28,035)
Cash Flows From Financing Activities      
Exercise of options 9,533 5,797 10,259
Excess income tax benefit from the exercise of stock options 3,113 1,829 2,992
Increase (Decrease) in other long-term liabilities (155) (750) (1,217)
Net Cash From Financing Activities 12,491 6,876 12,034
Effect of Exchange Rate on Cash (113) (167) 196
Net Increase (Decrease) In Cash and Cash Equivalents 987 13,201 13,038
Cash And Cash Equivalents At Beginning of Year 49,045 35,844 22,806
Cash And Cash Equivalents At End of Year 50,032 49,045 35,844
Supplement Cash Flow Information      
Income taxes paid, net of refunds $ 8,986 $ 6,445 $ 9,863