Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Operating activities:
Net earnings	$ 72,682	$ 18,888	$ 622,908	$ 73,355
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	21,893	22,780	65,664	69,553
Impairment of goodwill and long-lived assets	0	34,627	13,739	75,228
Provision for (benefit from) deferred income taxes	(30,129)	(5,006)	9,126	(1,661)
Bad debt (income) expense	(95)	273	(160)	584
Equity in net income of unconsolidated affiliates, net of distributions	(13,288)	(4,474)	(15,437)	(19,271)
Net (gain) loss on sale of assets	27,641	(5,838)	35,314	(5,237)
Stock-based compensation	4,727	2,725	14,437	10,000
Gains on investment in Nikola	(2,740)	0	(655,102)	0
Charitable contribution of Nikola shares	0	0	20,653	0
Loss on extinguishment of debt	0	0	0	4,034
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	(32,105)	5,992	(110,719)	15,517
Inventories	(96,836)	3,024	(6,591)	90,907
Accounts payable	62,299	29,630	157,629	(28,347)
Accrued compensation and employee benefits	10,779	(9,144)	48,591	(22,740)
Income taxes payable	(2,474)	391	36,567	(741)
Other operating items, net	(13,098)	(6,547)	(2,547)	(5,331)
Net cash provided by operating activities	9,256	87,321	234,072	255,850
Investing activities:
Investment in property, plant and equipment	(16,377)	(21,219)	(65,321)	(71,774)
Proceeds from sale of Nikola shares	146,590	0	634,449	0
Acquisitions, net of cash acquired	(129,743)	(500)	(129,818)	(29,783)
Proceeds from sale of assets, net	(985)	119	20,595	9,318
Net cash provided (used) by investing activities	(515)	(21,600)	459,905	(92,239)
Financing activities:
Proceeds from long-term debt, net of issuance costs	0	0	0	101,464
Principal payments on long-term obligations and debt redemption costs	(99)	(344)	(292)	(154,811)
Proceeds from issuance of common shares, net of tax withholdings	565	429	1,709	(6,595)
Payments to noncontrolling interests	(7,250)	0	(7,810)	(1,453)
Repurchase of common shares	(52,367)	(21,373)	(145,250)	(50,972)
Dividends paid	(13,215)	(13,263)	(40,027)	(40,177)
Net cash used by financing activities	(72,366)	(34,551)	(191,670)	(152,544)
Increase (decrease) in cash and cash equivalents	(63,625)	31,170	502,307	11,067
Cash and cash equivalents at beginning of period	713,130	72,260	147,198	92,363
Cash and cash equivalents at end of period	$ 649,505	$ 103,430	$ 649,505	$ 103,430