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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Nov. 30, 2013
Nov. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 13,924 $ 13,455
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,170 3,291
Share based compensation 1,695 1,406
Excess income tax benefit from the exercise of stock options (2,107) (1,500)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable (5,001) (1,297)
Inventories (3,718) (2,076)
Prepaid expenses and other current assets (104) (1,337)
Accounts payable, accruals and other 1,870 (608)
NET CASH PROVIDED BY OPERATING ACTIVITIES 10,729 11,334
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment and other assets (4,491) (3,370)
Proceeds from the sale of marketable securities 52,083 34,153
Purchases of marketable securities (52,225) (44,082)
Payments for business (22,080) (9,918)
NET CASH USED IN INVESTING ACTIVITIES (26,713) (23,217)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Increase (decrease) in other long-term liabilities 110 (90)
Net proceeds from issuance of common stock 6,871 2,586
Excess income tax benefit from the exercise of stock options 2,107 1,500
NET CASH PROVIDED BY FINANCING ACTIVITIES 9,088 3,996
EFFECT OF EXCHANGE RATE ON CASH 477 151
DECREASE IN CASH (6,419) (7,736)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 50,032 49,045
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 43,613 $ 41,309