Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Operating activities:
Net earnings (loss)	$ 113,185	$ (68,512)	$ 254,660	$ 550,226
Adjustments to reconcile net earnings (loss) to net cash (used) provided by operating activities:
Depreciation and amortization	21,090	21,560	43,154	43,771
Impairment of long-lived assets	0	3,815	0	13,739
Provision for (benefit from) deferred income taxes	1,309	(31,776)	2,675	39,255
Bad debt expense (income)	335	(159)	514	(65)
Equity in net income of unconsolidated affiliates, net of distributions	(31,274)	4,608	(64,492)	(2,149)
Net (gain) loss on sale of assets	(496)	7,271	(13,202)	7,673
Stock-based compensation	4,248	4,854	7,551	9,710
(Gains) loss on investment in Nikola	0	143,780	0	(652,362)
Charitable contribution of Nikola shares	0	0	0	20,653
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	(89,817)	3,580	(121,685)	(78,614)
Inventories	(97,182)	4,623	(260,864)	90,245
Accounts payable	(47,594)	48,176	(926)	95,330
Accrued compensation and employee benefits	14,358	13,960	(31,819)	37,812
Income taxes payable	(22,922)	(44,623)	12,935	39,041
Other operating items, net	15,656	(3,729)	2,583	10,551
Net cash (used) provided by operating activities	(119,104)	107,428	(168,916)	224,816
Investing activities:
Investment in property, plant and equipment	(24,234)	(16,073)	(48,159)	(48,944)
Acquisitions, net of cash acquired	(3,000)	(75)	(107,750)	(75)
Proceeds from sale of assets, net	5,136	21,580	31,821	21,580
Proceeds from sale of Nikola shares	0	0	0	487,859
Net cash (used) provided by investing activities	(22,098)	5,432	(124,088)	460,420
Financing activities:
Principal payments on long-term obligations and debt redemption costs	(10)	(96)	(402)	(193)
Proceeds from issuance of common shares, net of tax withholdings	(2,694)	2,294	(6,785)	1,144
Payments to noncontrolling interests	(2,879)	0	(12,076)	(560)
Repurchase of common shares	(12,702)	(38,563)	(73,587)	(92,883)
Dividends paid	(14,565)	(13,433)	(29,263)	(26,812)
Net cash used by financing activities	(32,850)	(49,798)	(122,113)	(119,304)
(Decrease) increase in cash and cash equivalents	(174,052)	63,062	(415,117)	565,932
Cash and cash equivalents at beginning of period	399,246	650,068	640,311	147,198
Cash and cash equivalents at end of period	$ 225,194	$ 713,130	$ 225,194	$ 713,130