Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Operating activities
Net earnings	$ 44,211	$ 37,331	$ 128,904	$ 104,818
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	20,208	17,048	59,763	48,136
Impairment of long-lived assets			35,375	1,520
Provision for deferred income taxes	1,278	6,491	(20,256)	9,850
Bad debt expense (income)	(134)	76	(430)	575
Equity in net income of unconsolidated affiliates, net of distributions	1,048	(4,841)	(8,373)	(19,256)
Net gain (loss) on sale of assets	990	(153)	(10,860)	(222)
Stock-based compensation	4,705	3,653	13,207	10,586
Excess tax benefits - stock-based compensation	(1,462)	(3,455)	(7,294)	(3,455)
Gain on previously held equity interest in TWB			(11,000)
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	(30,228)	(41,672)	(14,999)	27,078
Inventories	(38,260)	(15,158)	(59,583)	42,743
Prepaid expenses and other current assets	2,429	32	4,136	1,634
Other assets	(762)	198	(187)	3,135
Accounts payable and accrued expenses	91,485	35,320	108,185	(34,871)
Other liabilities	1,316	1,434	4,019	3,412
Net cash provided by operating activities	96,824	36,304	220,607	195,683
Investing activities
Investment in property, plant and equipment	(21,743)	(9,786)	(52,157)	(34,402)
Acquisitions, net of cash acquired	(35,599)		17,634	(62,110)
Distributions from unconsolidated affiliates			9,223
Proceeds from sale of assets	580	552	24,313	16,227
Net cash used by investing activities	(56,762)	(9,234)	(987)	(80,285)
Financing activities
Net payments of short-term borrowings	(8,347)	(13,390)	(78,624)	(251,586)
Proceeds from long-term debt				150,000
Principal payments on long-term debt	(286)	(365)	(855)	(1,170)
Proceeds from (payments for) issuance of common shares	(1,241)	17,332	5,246	32,960
Excess tax benefits - stock-based compensation	1,462	3,455	7,294	3,455
Distributions to noncontrolling interest	(36,512)	(2,592)	(39,150)	(8,582)
Repurchase of common shares	(40,762)		(91,078)
Dividends paid	(10,545)	(27,040)	(20,952)	(44,144)
Net cash used by financing activities	(96,231)	(22,600)	(218,119)	(119,067)
Increase (decrease) in cash and cash equivalents	(56,169)	4,470	1,501	(3,669)
Cash and cash equivalents at beginning of period	109,055	32,889	51,385	41,028
Cash and cash equivalents at end of period	$ 52,886	$ 37,359	$ 52,886	$ 37,359