CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Cash Flows From Operating Activities:
Net income	$ 83,954	$ 137,259
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	27,644	25,891
Amortization	13,282	11,027
Impairment on investment in Kemrock	51,092
Deferred income taxes	3,973	(1,620)
Stock-based compensation expense	8,135	6,692
Other	(685)	(5,204)
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
Decrease in receivables	51,830	76,864
(Increase) in inventory	(33,198)	(24,687)
Decrease (increase) in prepaid expenses and other current and long-term assets	14,799	(10,040)
(Decrease) in accounts payable	(89,300)	(46,345)
(Decrease) in accrued compensation and benefits	(43,108)	(36,662)
Increase (decrease) in accrued loss reserves	5,393	(5,313)
Increase (decrease) in other accrued liabilities	36,663	(14,952)
Other	(2,853)	(2,880)
Cash From Operating Activities	127,621	110,030
Cash Flows From Investing Activities:
Capital expenditures	(30,849)	(18,353)
Acquisition of businesses, net of cash acquired	(396,785)	(132,905)
Purchase of marketable securities	(68,442)	(39,337)
Proceeds from sales of marketable securities	58,194	36,937
Other	4,103	4,072
Cash (Used For) Investing Activities	(433,779)	(149,586)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt	334,247	7,215
Reductions of long-term and short-term debt	(41,269)	(22,845)
Cash dividends	(58,054)	(55,620)
Repurchase of stock	(1,094)	(5,999)
Other	5,650	3,181
Cash From (Used For) Financing Activities	239,480	(74,068)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	12,650	(20,432)
Net Change in Cash and Cash Equivalents	(54,028)	(134,056)
Cash and Cash Equivalents at Beginning of Period	315,968	435,011
Cash and Cash Equivalents at End of Period	$ 261,940	$ 300,955