CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Cash Flows From Operating Activities:
Net income	$ 137,259	$ 128,497
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	25,891	26,788
Amortization	11,027	9,906
Deferred income taxes	(1,620)	5,323
Stock-based compensation expense	6,692	6,027
Other	(5,204)	(64)
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
Decrease in receivables	76,864	66,393
(Increase) in inventory	(24,687)	(44,880)
(Increase) in prepaid expenses and other current and long-term assets	(10,040)	(11,155)
(Decrease) in accounts payable	(46,345)	(27,969)
(Decrease) in accrued compensation and benefits	(36,662)	(21,700)
(Decrease) in accrued loss reserves	(5,313)	(2,092)
(Decrease) increase in other accrued liabilities	(14,952)	45,067
Other	(2,880)	2,973
Cash From Operating Activities	110,030	183,114
Cash Flows From Investing Activities:
Capital expenditures	(18,353)	(15,333)
Acquisition of businesses, net of cash acquired	(132,905)	(20,669)
Purchase of marketable securities	(39,337)	(37,282)
Proceeds from sales of marketable securities	36,937	38,828
Other	4,072	(1,324)
Cash (Used For) Investing Activities	(149,586)	(35,780)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt	7,215	24,913
Reductions of long-term and short-term debt	(22,845)	(28,391)
Cash dividends	(55,620)	(53,911)
Repurchase of stock	(5,999)	(20,916)
Exercise of stock options	3,181	2,614
Cash (Used For) Financing Activities	(74,068)	(75,691)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(20,432)	12,159
Net Change in Cash and Cash Equivalents	(134,056)	83,802
Cash and Cash Equivalents at Beginning of Period	435,011	215,355
Cash and Cash Equivalents at End of Period	$ 300,955	$ 299,157