Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015
Cash Flows From Operating Activities:
Net income	$ 43,138	$ 184,511
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation	35,568	33,509
Amortization	22,111	22,144
Goodwill and other intangible asset impairments	188,298
Reversal of contingent earnout obligations		(14,500)
Deferred income taxes	(59,363)	(680)
Stock-based compensation expense	17,013	15,524
Other non-cash interest expense	4,964	4,862
Realized (gains) on sales of marketable securities	(3,698)	(4,418)
Other	(47)	1,441
Changes in assets and liabilities, net of effect from purchases and sales of businesses:
Decrease in receivables	110,871	117,358
(Increase) in inventory	(81,586)	(49,781)
(Increase) decrease in prepaid expenses and other current and long-term assets	(20,876)	4,617
(Decrease) in accounts payable	(69,518)	(105,841)
(Decrease) in accrued compensation and benefits	(55,662)	(45,649)
(Decrease) increase in accrued losses	(899)	715
Increase in other accrued liabilities	28,057	7,375
Other	361	(4,114)
Cash Provided By Operating Activities	158,732	167,073
Cash Flows From Investing Activities:
Capital expenditures	(48,049)	(31,295)
Acquisition of businesses, net of cash acquired	(65,201)	(12,006)
Purchase of marketable securities	(25,142)	(14,213)
Proceeds from sales of marketable securities	24,588	11,737
Other	956	5,355
Cash (Used For) Investing Activities	(112,848)	(40,422)
Cash Flows From Financing Activities:
Additions to long-term and short-term debt	76,369	38,765
Reductions of long-term and short-term debt	(73,588)	(18,774)
Cash dividends	(76,604)	(71,276)
Shares repurchased and returned for taxes	(19,663)	(45,292)
Payments of acquisition-related contingent consideration	(4,130)	(1,631)
Other	(1,365)	270
Cash (Used For) Financing Activities	(98,981)	(97,938)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(6,148)	(12,815)
Net Change in Cash and Cash Equivalents	(59,245)	15,898
Cash and Cash Equivalents at Beginning of Period	265,152	174,711
Cash and Cash Equivalents at End of Period	$ 205,907	$ 190,609