Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Operating activities
Net earnings	$ 37,331	$ 28,398	$ 104,818	$ 70,939
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	17,048	14,653	48,136	40,626
Impairment of long-lived assets			1,520
Provision for deferred income taxes	6,491	(667)	9,850	7,511
Bad debt expense	76	316	575	205
Equity in net income of unconsolidated affiliates, net of distributions	(4,841)	3,998	(19,256)	1,711
Net loss (gain) on sale of assets	(153)	143	(222)	(1,925)
Stock-based compensation	3,653	2,797	10,586	8,576
Excess tax benefits - stock-based compensation	(3,455)		(3,455)
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	(41,672)	(28,643)	27,078	27,449
Inventories	(15,158)	(31,049)	42,743	23,726
Prepaid expenses and other current assets	32	9,576	1,634	13,126
Other assets	198	(1,046)	3,135	1,794
Accounts payable and accrued expenses	35,320	90,258	(34,871)	(56,871)
Other liabilities	1,434	(1,296)	3,412	86
Net cash provided by operating activities	36,304	87,438	195,683	136,953
Investing activities
Investment in property, plant and equipment, net	(9,786)	(5,769)	(34,402)	(15,800)
Acquisitions, net of cash acquired		(152,389)	(62,110)	(232,171)
Investments in unconsolidated affiliates		44,023		43,238
Proceeds from sale of assets	552	3,178	16,227	14,525
Net cash used by investing activities	(9,234)	(110,957)	(80,285)	(190,208)
Financing activities
Net proceeds from (repayments of) short-term borrowings	(13,390)	15,329	(251,586)	108,460
Proceeds from long-term debt			150,000
Principal payments on long-term debt	(365)	(95)	(1,170)	(95)
Proceeds from issuance of common shares	17,332	1,186	32,960	9,709
Excess tax benefits - stock-based compensation	3,455		3,455
Dividends paid to noncontrolling interest, net of contributions	(2,592)	(3,168)	(8,582)	(9,744)
Repurchase of common shares				(52,120)
Dividends paid	(27,040)	(8,273)	(44,144)	(23,856)
Net cash provided (used) by financing activities	(22,600)	4,979	(119,067)	32,354
Increase (decrease) in cash and cash equivalents	4,470	(18,540)	(3,669)	(20,901)
Cash and cash equivalents at beginning of period	32,889	53,806	41,028	56,167
Cash and cash equivalents at end of period	$ 37,359	$ 35,266	$ 37,359	$ 35,266