Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Cash Flows From Operating Activities:
Net income	$ 106,889	$ 37,867
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	14,431	13,330
Amortization	7,882	6,735
Impairment on investment in Kemrock		40,273
Deferred income taxes	(11,505)	1,874
Stock-based compensation expense	4,826	3,873
Other	(701)	(442)
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
(Increase) decrease in receivables	(76,455)	7,162
(Increase) in inventory	(23,439)	(24,650)
(Increase) decrease in prepaid expenses and other current and long-term assets	(7,201)	554
(Decrease) in accounts payable	(83,264)	(54,226)
(Decrease) in accrued compensation and benefits	(46,001)	(56,362)
(Decrease) in accrued loss reserves	(499)	(118)
Increase in other accrued liabilities	47,701	53,198
(Decrease) in contingent payment	(61,894)
Other	(232)	(11,334)
Cash (Used For) Provided By Operating Activities	(129,462)	17,734
Cash Flows From Investing Activities:
Capital expenditures	(10,696)	(12,702)
Acquisition of businesses, net of cash acquired	(12,328)	(141,203)
Purchase of marketable securities	(20,152)	(55,744)
Proceeds from sales of marketable securities	17,786	51,172
Other	3,092	15,403
Cash (Used For) Investing Activities	(22,298)	(143,074)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt	53,218	147,547
Reductions of long-term and short-term debt	(1,936)	(63,193)
Cash dividends	(29,836)	(28,281)
Repurchase of stock	(4,004)	(260)
Other	(2,388)	803
Cash Provided By Financing Activities	15,054	56,616
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(1,945)	10,138
Net Change in Cash and Cash Equivalents	(138,651)	(58,586)
Cash and Cash Equivalents at Beginning of Period	343,554	315,968
Cash and Cash Equivalents at End of Period	$ 204,903	$ 257,382