Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Cash Flows From Operating Activities:
Net income	$ 100,362	$ 104,839
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation	16,775	15,048
Amortization	11,092	8,246
Deferred income taxes	(8,207)	1,984
Stock-based compensation expense	6,707	5,700
Other	2,093	(605)
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
Decrease (increase) in receivables	19,112	(72,292)
(Increase) in inventory	(52,082)	(17,338)
Decrease (increase) in prepaid expenses and other current and long-term assets	186	(2,307)
(Decrease) in accounts payable	(65,285)	(115,686)
(Decrease) in accrued compensation and benefits	(65,704)	(70,880)
(Decrease) in accrued losses	(1,466)	(8,311)
Increase in other accrued liabilities	35,868	29,911
Other	7,144	(3,542)
Cash Provided By (Used For) Operating Activities	6,595	(125,233)
Cash Flows From Investing Activities:
Capital expenditures	(12,035)	(12,050)
Acquisition of businesses, net of cash acquired	(5,120)	(33,472)
Purchase of marketable securities	(4,775)	(5,034)
Proceeds from sales of marketable securities	8,843	7,512
Other	2,750	(319)
Cash (Used For) Investing Activities	(10,337)	(43,363)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt	94,516	131,907
Reductions of long-term and short-term debt	(18,401)	(5,468)
Cash dividends	(34,634)	(31,987)
Shares repurchased and returned for taxes	(35,348)	(4,695)
Payments of acquisition-related contingent consideration	(1,585)	(24,750)
Other	267	244
Cash Provided By Financing Activities	4,815	65,251
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(6,326)	(4,498)
Net Change in Cash and Cash Equivalents	(5,253)	(107,843)
Cash and Cash Equivalents at Beginning of Period	174,711	332,868
Cash and Cash Equivalents at End of Period	$ 169,458	$ 225,025