Consolidated Balance Sheets (USD $) In Thousands	May 31, 2011	May 31, 2010
CURRENT ASSETS:
Cash and cash equivalents	$ 302,603	$ 202,649
Trade accounts receivable, net of allowance for doubtful accounts of $2,157 and $2,122 at May 31, 2011 and May 31, 2010, respectively	63,324	59,578
Inventories	32,914	35,730
Deferred income tax assets, current portion	15,884	14,807
Prepaid expenses and other current assets	11,164	4,832
Total current assets	425,889	317,596
PROPERTY AND EQUIPMENT, Net	58,216	49,169
GOODWILL	93,767	94,336
INTANGIBLE ASSETS, Net	54,133	57,628
DEFERRED INCOME TAX ASSETS	376	540
OTHER ASSETS	746	565
Total assets	633,127	519,834
CURRENT LIABILITIES:
Accounts payable	10,790	7,973
Accrued expenses and other current liabilities	20,331	17,378
Income taxes payable	8,294	12,312
Deferred revenue, current portion	7,495	8,994
Total current liabilities	46,910	46,657
DEFERRED REVENUE	6,080	7,687
DEFERRED INCOME TAX LIABILITIES	9,264	7,368
OTHER LONG-TERM LIABILITIES	2,001	1,999
Total liabilities	64,255	63,711
SHAREHOLDERS' EQUITY:
Common stock, $0.10 par value; authorized 120,000,000 shares, issued and outstanding 70,367,219 and 69,912,449 shares at May 31, 2011 and May 31, 2010, respectively	7,037	6,991
Additional paid-in capital	45,729	36,256
Retained earnings	499,152	409,825
Accumulated other comprehensive income	16,954	3,051
Total shareholders' equity	568,872	456,123
Total liabilities and shareholders' equity	$ 633,127	$ 519,834