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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 18,431 $ 16,735
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,680 5,170
Share based compensation 2,545 1,959
Excess income tax benefit from the exercise of stock options (2,443) (1,132)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable 2,514 (91)
Inventories (8,784) (2,066)
Prepaid expenses and other current assets (1,858) 3,368
Accounts payable, accruals and other 4,776 (576)
NET CASH FROM OPERATING ACTIVITIES 20,861 23,367
CASH FLOWS FOR INVESTING ACTIVITIES:    
Purchases of property and equipment and other noncurrent assets (7,815) (4,705)
Proceeds from the sale of marketable securities 80,379 42,342
Purchases of marketable securities (83,916) (51,768)
Business acquisitions, net of cash required (13,554) (4,514)
NET CASH FOR INVESTING ACTIVITIES (24,906) (18,645)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Exercise of stock options 6,611 3,248
Excess income tax benefit from the exercise of stock options 2,443 1,132
Increase in other long-term liabilities 0 0
NET CASH FROM FINANCING ACTIVITIES 9,054 4,380
EFFECT OF EXCHANGE RATE ON CASH 308 (719)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 5,317 8,383
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 66,061 40,675
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 71,378 $ 49,058