Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Operating activities:
Net earnings	$ 18,888	$ 29,548	$ 73,355	$ 124,298
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	22,780	23,625	69,553	71,643
Impairment of goodwill and long-lived assets	34,627	0	75,228	2,381
Provision for (benefit from) deferred income taxes	(5,006)	(730)	(1,661)	21,493
Bad debt expense	273	201	584	454
Equity in net income of unconsolidated affiliates, net of distributions	(4,474)	(865)	(19,271)	3,298
Net gain on sale of assets	(5,838)	(12,606)	(5,237)	(10,203)
Stock-based compensation	2,725	1,143	10,000	7,755
Loss on extinguishment of debt	0	0	4,034	0
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	5,992	1,546	15,517	55,793
Inventories	3,024	(1,054)	90,907	(38,525)
Accounts payable	29,630	19,002	(28,347)	(51,158)
Accrued compensation and employee benefits	(9,144)	(11,391)	(22,740)	(38,769)
Other operating items, net	(6,156)	3,619	(6,072)	(21,273)
Net cash provided by operating activities	87,321	52,038	255,850	127,187
Investing activities:
Investment in property, plant and equipment	(21,219)	(19,379)	(71,774)	(60,554)
Acquisitions	(500)	0	(29,783)	0
Distributions from unconsolidated affiliate	0	1,492	0	56,693
Proceeds from sale of assets	119	27,843	9,318	48,290
Net cash provided (used) by investing activities	(21,600)	9,956	(92,239)	44,429
Financing activities:
Proceeds from long-term debt, net of issuance costs	0	0	101,464	0
Principal payments on long-term obligations and debt redemption costs	(344)	(303)	(154,811)	(1,104)
Proceeds from issuance of common shares, net of tax withholdings	429	104	(6,595)	(4,645)
Payments to noncontrolling interests	0	0	(1,453)	(6,327)
Repurchase of common shares	(21,373)	(28,587)	(50,972)	(129,020)
Dividends paid	(13,263)	(13,119)	(40,177)	(39,371)
Net cash used by financing activities	(34,551)	(41,905)	(152,544)	(180,467)
Increase (decrease) in cash and cash equivalents	31,170	20,089	11,067	(8,851)
Cash and cash equivalents at beginning of period	72,260	93,027	92,363	121,967
Cash and cash equivalents at end of period	$ 103,430	$ 113,116	$ 103,430	$ 113,116