Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Operating activities
Net earnings	$ 34,437	$ 48,820
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	21,440	20,367
Impairment of long-lived assets	3,000	1,950
Provision for deferred income taxes	(5,540)	(535)
Bad debt expense (income)	10	(203)
Equity in net income of unconsolidated affiliates, net of distributions	(5,513)	(6,990)
Net loss (gain) on sale of assets	1,606	(2,830)
Stock-based compensation	3,777	4,355
Excess tax benefits - stock-based compensation	(824)	(5,132)
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	42,629	12,752
Inventories	(7,824)	(51,217)
Prepaid expenses and other current assets	11,166	(2,872)
Other assets	442	121
Accounts payable and accrued expenses	42,184	41,890
Other liabilities	(3,187)	(5,991)
Net cash provided by operating activities	137,803	54,485
Investing activities
Investment in property, plant and equipment	(38,497)	(23,873)
Investment in notes receivable		(5,000)
Acquisitions, net of cash acquired		(36,550)
Investments in unconsolidated affiliates	(1,687)	(3,800)
Proceeds from sale of assets and insurance	131	265
Net cash used by investing activities	(40,053)	(68,958)
Financing activities
Net proceeds from (repayments of) short-term borrowings	(68,511)	555
Proceeds from long-term debt	921
Principal payments on long-term debt	(208)	(302)
Payments for issuance of common shares	(602)	(1,020)
Excess tax benefits - stock-based compensation	824	5,132
Payments to noncontrolling interest	(3,336)	(2,867)
Repurchase of common shares	(27,582)	(20,071)
Dividends paid	(11,551)	(10,112)
Net cash used by financing activities	(110,045)	(28,685)
Decrease in cash and cash equivalents	(12,295)	(43,158)
Cash and cash equivalents at beginning of period	31,067	190,079
Cash and cash equivalents at end of period	$ 18,772	$ 146,921