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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Feb. 28, 2013
Feb. 29, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 20,064 $ 16,448
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,103 4,489
Share based compensation 2,198 1,757
Excess income tax benefit from the exercise of stock options (1,868) (1,432)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable (2,607) (5,695)
Inventories (4,851) (4,363)
Prepaid expenses and other current assets (1,301) 1,564
Accounts payable, accruals and other 2,981 467
NET CASH PROVIDED BY OPERATING ACTIVITIES 19,719 13,235
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment and other assets (6,802) (10,820)
Proceeds from the sale of marketable securities 50,055 55,883
Purchases of marketable securities (56,160) (54,281)
Payments for business (13,318) (813)
NET CASH USED IN INVESTING ACTIVITIES (26,225) (10,031)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Increase (decrease) in other long-term liabilities (87) (750)
Net proceeds from issuance of common stock 4,612 3,024
Excess income tax benefit from the exercise of stock options 1,868 1,432
NET CASH PROVIDED BY FINANCING ACTIVITIES 6,393 3,706
EFFECT OF EXCHANGE RATE ON CASH (71) (56)
DECREASE IN CASH (184) 6,854
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 49,045 35,844
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 48,861 $ 42,698