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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 20,478 $ 20,064
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,641 5,272
Share based compensation 2,689 2,198
Excess income tax benefit from the exercise of stock options (3,948) (1,868)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable (6,789) (2,607)
Inventories (4,060) (4,851)
Prepaid expenses and other current assets (963) (1,301)
Accounts payable, accruals and other 3,114 2,981
NET CASH PROVIDED BY OPERATING ACTIVITIES 17,162 19,888
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment and other assets (7,347) (6,971)
Proceeds from the sale of marketable securities 76,996 50,055
Purchases of marketable securities (67,192) (56,160)
Payments for businesses (39,265) (13,318)
NET CASH USED IN INVESTING ACTIVITIES (36,808) (26,394)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Increase (decrease) in other long-term liabilities 168 (87)
Net proceeds from issuance of common stock 8,112 4,612
Excess income tax benefit from the exercise of stock options 3,948 1,868
NET CASH PROVIDED BY FINANCING ACTIVITIES 12,228 6,393
EFFECT OF EXCHANGE RATE ON CASH 662 (71)
DECREASE IN CASH (6,756) (184)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 50,032 49,045
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 43,277 $ 48,861