Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		May 31, 2020	May 31, 2019	May 31, 2018
Cash Flows From Operating Activities:
Net Income		$ 305,082	$ 267,687	$ 339,257
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation & Amortization		156,842	141,742	128,499
Restructuring charges, net of payments		6,831	8,072	17,514
Goodwill, intangible and other asset impairments			4,190
Fair value adjustments to contingent earnout obligations		680	1,918	3,400
Deferred income taxes		(12,150)	5,434	(10,690)
Stock-based compensation expense		19,789	31,154	25,440
Other non-cash interest expense			1,552	6,187
Realized/unrealized losses (gains) on sales of marketable securities		(1,132)	7,613	(10,076)
Loss on extinguishment of debt	[1]		3,051
Other		(77)	(3,288)	(1,141)
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
Decrease (Increase) in receivables		82,060	(131,204)	(106,179)
Decrease (Increase) in inventory		21,309	(16,829)	(34,102)
Decrease (Increase) in prepaid expenses and other current and long-term assets		17,614	(14,826)	3,348
(Decrease) increase in accounts payable		(27,111)	(29,628)	51,641
(Decrease) increase in accrued compensation and benefits		(6,198)	19,241	(5,010)
(Decrease) increase in accrued losses		487	(1,803)	(10,387)
(Decrease) in other accrued liabilities		(23,665)	(5,232)	(6,612)
Other		9,558	4,097	(706)
Cash Provided By Operating Activities		549,919	292,941	390,383
Cash Flows From Investing Activities:
Capital expenditures		(147,756)	(136,757)	(114,619)
Acquisition of businesses, net of cash acquired		(65,102)	(168,205)	(112,442)
Purchase of marketable securities		(28,891)	(19,787)	(181,953)
Proceeds from sales of marketable securities		31,337	69,743	138,803
Other		799	6,760	9,018
Cash (Used For) Investing Activities		(209,613)	(248,246)	(261,193)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt		485,306	628,083	351,082
Reductions of long-term and short-term debt		(471,035)	(273,109)	(276,406)
Cash dividends		(185,101)	(181,409)	(167,476)
Repurchase of common stock		(125,000)	(200,222)
Shares of common stock returned for taxes		(18,075)	(21,758)	(17,152)
Payments of acquisition-related contingent consideration		(606)	(4,066)	(3,945)
Payments for 524(g) trust				(123,567)
Other		(2,359)	(1,361)	(1,912)
Cash (Used For) Financing Activities		(316,870)	(53,842)	(239,376)
Effect of Exchange Rate Changes on Cash and Cash Equivalents		(13,188)	(12,107)	4,111
Net Change in Cash and Cash Equivalents		10,248	(21,254)	(106,075)
Cash and Cash Equivalents at Beginning of Period		223,168	244,422	350,497
Cash and Cash Equivalents at End of Period		233,416	223,168	244,422
Cash paid during the year for:
Interest		103,143	101,415	97,295
Income taxes, net of refunds		$ 102,892	68,357	$ 83,460
Supplemental Disclosures of Non-Cash Investing and Financing Activities:
Conversion of Debt to Equity			$ 38,239

[1] Reflects the loss incurred upon divestiture of a contracting business located in Australia, which had reported through our PCG segment. In connection with the redemption of all of our outstanding 2.25% convertible senior notes in November 2018, we recognized a loss of $3.1 million, due to the fair value remeasurement on the date of conversion