Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Operating activities:
Net earnings	$ 56,958	$ 48,074
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	24,493	25,365
Impairment of long-lived assets	2,381
Provision for deferred income taxes	18,934	7,934
Bad debt (income) expense	221	(62)
Equity in net income of unconsolidated affiliates, net of distributions	(10,019)	(7,755)
Net loss on assets	2,715	1,425
Stock-based compensation	3,156	3,407
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	13,409	62,678
Inventories	(43,337)	(34,696)
Prepaid expenses and other current assets	(8,419)	1,143
Other assets	(66)	(350)
Accounts payable and accrued expenses	(28,785)	(26,791)
Other liabilities	(1,196)	2,983
Net cash provided by operating activities	30,445	83,355
Investing activities:
Investment in property, plant and equipment	(19,434)	(18,013)
Acquisitions, net of cash acquired		(284,505)
Proceeds from sale of assets	20,277	427
Net cash provided (used) by investing activities	843	(302,091)
Financing activities:
Net proceeds from short-term borrowings, net of issuance costs		298
Proceeds from long-term debt, net of issuance costs		198,279
Principal payments on long-term debt	(430)	(219)
Payments for issuance of common shares, net of tax withholdings	(4,091)	(3,274)
Payments to noncontrolling interests	(2,320)	(720)
Repurchase of common shares	(36,852)	(45,076)
Dividends paid	(12,719)	(12,778)
Net cash provided (used) by financing activities	(56,412)	136,510
Decrease in cash and cash equivalents	(25,124)	(82,226)
Cash and cash equivalents at beginning of period	121,967	278,081
Cash and cash equivalents at end of period	$ 96,843	$ 195,855