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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 9,289 $ 8,909
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,704 2,515
Share based compensation 1,297 907
Excess income tax benefit from the exercise of stock options (1,880) (865)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable 1,209 155
Inventories (3,310) (3,933)
Prepaid expenses and other current assets (2,725) 2,843
Accounts payable, accruals and other 16 (106)
NET CASH FROM OPERATING ACTIVITIES 6,600 10,425
CASH FLOWS FOR INVESTING ACTIVITIES:    
Purchases of property, equipment and other noncurrent assets (2,821) (2,511)
Proceeds from the sale of marketable securities 28,648 22,946
Purchases of marketable securities (49,174) (21,765)
Business acquisitions, net of cash acquired (13,126) 0
NET CASH FOR INVESTING ACTIVITIES (36,473) (1,330)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Exercise of stock options 4,293 2,933
Excess income tax benefit from the exercise of stock options 1,880 865
Increase (decrease) in other long-term liabilities 0 0
NET CASH FROM BY FINANCING ACTIVITIES 6,173 3,798
EFFECT OF EXCHANGE RATE ON CASH AND CASH EQUIVALENTS (35) (111)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (23,735) 12,782
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 66,061 40,675
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 42,326 $ 53,457