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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Aug. 31, 2014
Aug. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 8,909 $ 7,697
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,515 2,029
Share based compensation 907 789
Excess income tax benefit from the exercise of stock options (865) (1,585)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable 155 (4,069)
Inventories (3,933) (3,207)
Prepaid expenses and other current assets 2,843 (96)
Accounts payable, accruals and other (106) 3,950
NET CASH PROVIDED BY OPERATING ACTIVITIES 10,425 5,508
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment and other noncurrent assets (2,511) (2,041)
Proceeds from the sale of marketable securities 22,946 25,732
Purchases of marketable securities (21,765) (31,162)
Business acquisitions, net of cash acquired 0 (10,012)
NET CASH USED IN INVESTING ACTIVITIES (1,330) (17,483)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Exercise of stock options 2,933 3,806
Excess income tax benefit from the exercise of stock options 865 1,585
Increase in other long-term liabilities 0 56
NET CASH PROVIDED BY FINANCING ACTIVITIES 3,798 5,447
EFFECT OF EXCHANGE RATE ON CASH (111) 104
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 12,782 (6,424)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 40,675 50,032
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 53,457 $ 43,608