Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Operating activities:
Net earnings	$ 29,548	$ 78,297	$ 124,298	$ 167,993
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	23,625	25,338	71,643	76,986
Impairment of goodwill and long-lived assets			2,381	8,289
Provision for (benefit from) deferred income taxes	(730)	(27,373)	21,493	(20,022)
Bad debt (income) expense	201	17	454	(4)
Equity in net income of unconsolidated affiliates, net of distributions	(865)	2,835	3,298	(1,968)
Net gain on assets	(12,606)	(1,437)	(10,203)	(10,692)
Stock-based compensation	1,143	2,882	7,755	10,076
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	1,546	4,071	55,793	20,652
Inventories	(1,054)	(15,398)	(38,525)	(40,223)
Prepaid expenses and other current assets	(4,276)	(4,914)	(25,944)	(149)
Other assets	79	(2,069)	(1,181)	(3,045)
Accounts payable and accrued expenses	14,963	35,564	(85,533)	(12,804)
Other liabilities	464	2,107	1,458	7,568
Net cash provided by operating activities	52,038	99,920	127,187	202,657
Investing activities:
Investment in property, plant and equipment	(19,379)	(13,628)	(60,554)	(55,319)
Acquisitions, net of cash acquired				(285,028)
Distributions from unconsolidated affiliate	1,492		56,693
Proceeds from sale of assets	27,843	3	48,290	16,742
Net cash provided (used) by investing activities	9,956	(13,625)	44,429	(323,605)
Financing activities:
Net repayments of short-term borrowings, net of issuance costs		(1,108)		(508)
Proceeds from long-term debt, net of issuance costs				197,685
Principal payments on long-term debt	(303)	(374)	(1,104)	(813)
Proceeds from issuance of common shares, net of tax withholdings	104	581	(4,645)	(3,415)
Payments to noncontrolling interests			(6,327)	(3,916)
Repurchase of common shares	(28,587)	(47,418)	(129,020)	(159,942)
Dividends paid	(13,119)	(12,766)	(39,371)	(38,800)
Net cash used by financing activities	(41,905)	(61,085)	(180,467)	(9,709)
Increase (decrease) in cash and cash equivalents	20,089	25,210	(8,851)	(130,657)
Cash and cash equivalents at beginning of period	93,027	122,214	121,967	278,081
Cash and cash equivalents at end of period	$ 113,116	$ 147,424	$ 113,116	$ 147,424