Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Operating activities:
Net earnings (loss)	$ (2,455)	$ 56,958
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Depreciation and amortization	24,177	24,493
Impairment of long-lived assets	40,601	2,381
Provision for (benefit from) deferred income taxes	(3,498)	18,934
Bad debt expense	168	221
Equity in net income of unconsolidated affiliates, net of distributions	5,082	(10,019)
Net loss on sale of assets	618	2,715
Stock-based compensation	3,995	3,156
Loss on extinguishment of debt	4,034	0
Changes in assets and liabilities:
Receivables	14,981	13,409
Inventories	44,282	(43,337)
Accounts payable	(37,234)	2,814
Accrued compensation and employee benefits	(23,215)	(30,934)
Other operating items, net	(7,167)	(10,346)
Net cash provided by operating activities	64,369	30,445
Investing activities:
Investment in property, plant and equipment	(22,174)	(19,434)
Proceeds from sale of assets	9,176	20,277
Net cash provided (used) by investing activities	(12,998)	843
Financing activities:
Proceeds from long-term debt, net of issuance costs	101,598
Principal payments on long-term obligations and debt redemption costs	(153,977)	(430)
Payments for issuance of common shares, net of tax withholdings	(3,213)	(4,091)
Payments to noncontrolling interests		(2,320)
Repurchase of common shares	(29,599)	(36,852)
Dividends paid	(12,960)	(12,719)
Net cash used by financing activities	(98,151)	(56,412)
Decrease in cash and cash equivalents	(46,780)	(25,124)
Cash and cash equivalents at beginning of period	92,363	121,967
Cash and cash equivalents at end of period	$ 45,583	$ 96,843