CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Cash Flows From Operating Activities:
Net income	$ 83,340	$ 74,994
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,009	13,330
Amortization	5,110	4,874
Other-than-temporary impairments on marketable securities	407	57
Deferred income taxes	(1,374)	2,321
Stock-based compensation expense	3,125	2,396
Other	(490)	(281)
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
(Increase) decrease in receivables	(4,211)	10,016
(Increase) in inventory	(27,113)	(33,603)
(Increase) in prepaid expenses and other current and long-term assets	(7,531)	(12,102)
(Decrease) in accounts payable	(27,069)	(16,781)
(Decrease) in accrued compensation and benefits	(45,873)	(37,281)
(Decrease) in accrued loss reserves	(2,622)	(1,431)
Increase in other accrued liabilities	15,194	33,696
Other	3,574	918
Cash From Operating Activities	7,476	41,123
Cash Flows From Investing Activities:
Capital expenditures	(4,913)	(3,255)
Acquisition of businesses, net of cash acquired	(35,914)	(9,962)
Purchase of marketable securities	(11,315)	(19,296)
Proceeds from sales of marketable securities	13,821	20,676
Other	915	(3,634)
Cash (Used For) Investing Activities	(37,406)	(15,471)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt	7,391	9,773
Reductions of long-term and short-term debt	(10,824)	(2,635)
Cash dividends	(27,424)	(26,629)
Repurchase of stock	(204)	(9,101)
Exercise of stock options	1,205	281
Cash (Used For) Financing Activities	(29,856)	(28,311)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(1,870)	6,616
Net Change in Cash and Cash Equivalents	(61,656)	3,957
Cash and Cash Equivalents at Beginning of Period	435,011	215,355
Cash and Cash Equivalents at End of Period	$ 373,355	$ 219,312