CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Cash Flows From Operating Activities:
Net income	$ 37,867	$ 83,340
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,330	13,009
Amortization	6,028	5,110
Impairment on investment in Kemrock	40,273
Deferred income taxes	1,874	(1,374)
Stock-based compensation expense	3,873	3,125
Other	(443)	(83)
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
(Increase) in receivables	(1,095)	(4,211)
(Increase) in inventory	(30,666)	(27,113)
Decrease (increase) in prepaid expenses and other current and long-term assets	8,167	(6,370)
(Decrease) in accounts payable	(50,100)	(27,069)
(Decrease) in accrued compensation and benefits	(54,142)	(45,873)
Increase (decrease) in accrued loss reserves	820	(2,622)
Increase in other accrued liabilities	47,799	14,818
Other	(5,851)	2,789
Cash From Operating Activities	17,734	7,476
Cash Flows From Investing Activities:
Capital expenditures	(12,702)	(4,913)
Acquisition of businesses, net of cash acquired	(141,203)	(35,914)
Purchase of marketable securities	(55,744)	(11,315)
Proceeds from sales of marketable securities	49,320	13,821
Other	17,255	915
Cash (Used For) Investing Activities	(143,074)	(37,406)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt	147,547	7,391
Reductions of long-term and short-term debt	(63,193)	(10,824)
Cash dividends	(28,281)	(27,424)
Repurchase of stock	(260)	(204)
Exercise of stock options	803	1,205
Cash From (Used For) Financing Activities	56,616	(29,856)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	10,138	(1,870)
Net Change in Cash and Cash Equivalents	(58,586)	(61,656)
Cash and Cash Equivalents at Beginning of Period	315,968	435,011
Cash and Cash Equivalents at End of Period	$ 257,382	$ 373,355