Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Cash Flows From Operating Activities:
Net Income	$ 308,670	$ 183,818
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation and amortization	72,506	77,572
Restructuring charges, net of payments	(2,291)	(1,713)
Fair value adjustments to contingent earnout obligations	2,712
Deferred income taxes	1,786	(5,426)
Stock-based compensation expense	21,118	13,034
Net (gain) on marketable securities	(20,172)	(8,741)
Other	(194)	(705)
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
Decrease in receivables	91,027	183,782
Decrease (increase) in inventory	21,655	(41,129)
Decrease in prepaid expenses and other current and long-term assets	8,782	8,524
Increase (decrease) in accounts payable	8,331	(70,712)
(Decrease) in accrued compensation and benefits	(28,919)	(53,589)
Increase in accrued losses	3,377	1,894
Increase in other accrued liabilities	89,020	13,644
Other	2,095	(90)
Cash Provided By Operating Activities	579,503	300,163
Cash Flows From Investing Activities:
Capital expenditures	(70,943)	(71,393)
Acquisition of businesses, net of cash acquired	(113,618)	(36,281)
Purchase of marketable securities	(23,292)	(14,332)
Proceeds from sales of marketable securities	21,189	13,100
Other	703	2,183
Cash (Used For) Investing Activities	(185,961)	(106,723)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt	15	539,277
Reductions of long-term and short-term debt	(256,096)	(542,744)
Cash dividends	(96,019)	(92,040)
Repurchases of common stock		(100,000)
Shares of common stock returned for taxes	(15,729)	(10,155)
Payments of acquisition-related contingent consideration	(2,218)	(187)
Other		(664)
Cash (Used For) Financing Activities	(370,047)	(206,513)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	16,034	(1,922)
Net Change in Cash and Cash Equivalents	39,529	(14,995)
Cash and Cash Equivalents at Beginning of Period	233,416	223,168
Cash and Cash Equivalents at End of Period	272,945	208,173
Cash paid during the period for:
Interest	41,347	58,953
Income Taxes, net of refunds	$ 95,069	$ 73,322