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	$ 192,214	$ 41,762
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	43,706	41,858
Amortization	23,616	22,535
Impairment on investment in Kemrock		51,092
Loss contingency		68,846
Deferred income taxes	(1,422)	4,461
Stock-based compensation expense	15,541	12,354
Other	(2,143)	(10,120)
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
Decrease in receivables	86,480	144,749
(Increase) in inventory	(82,572)	(69,705)
Decrease in prepaid expenses and other current and long-term assets	3,885	14,356
(Decrease) in accounts payable	(145,393)	(88,350)
(Decrease) in accrued compensation and benefits	(23,935)	(42,897)
(Decrease) increase in accrued loss reserves	(5,804)	4,379
Increase (decrease) in other accrued liabilities	6,576	(5,136)
(Decrease) in contingent payment	(63,014)
Other	(21,832)	(19,322)
Cash Provided By Operating Activities	25,903	170,862
Cash Flows From Investing Activities:
Capital expenditures	(54,277)	(45,651)
Acquisition of businesses, net of cash acquired	(39,248)	(396,951)
Purchase of marketable securities	(37,909)	(82,054)
Proceeds from sales of marketable securities	45,306	88,572
Other	6,178	1,338
Cash (Used For) Investing Activities	(79,950)	(434,746)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt	262,211	318,994
Reductions of long-term and short-term debt	(231,137)	(45,247)
Cash dividends	(93,763)	(87,832)
Repurchase of stock	(9,685)	(2,329)
Other	(233)	3,750
Cash (Used For) Provided By Financing Activities	(72,607)	187,336
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(899)	7,684
Net Change in Cash and Cash Equivalents	(127,553)	(68,864)
Cash and Cash Equivalents at Beginning of Period	343,554	315,968
Cash and Cash Equivalents at End of Period	$ 216,001	$ 247,104