Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016
Cash flows from operating activities:
Net income	$ 396,473	$ 562,622
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	120,493	110,535
Amortization of intangible assets	11,221	12,136
Stock-based compensation	63,578	57,169
Gain on Storage transactions	0	(15,786)
Gain on Shred-it	25,876	349,738
Deferred income taxes	(3,472)	(74,540)
Change in current assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	(28,646)	(41,523)
Inventories, net	(23,364)	(24,009)
Uniforms and other rental items in service	(53)	(6,905)
Prepaid expenses and other current assets	(11,387)	(1,580)
Accounts payable	15,538	37,370
Accrued compensation and related liabilities	(5,812)	(3,731)
Accrued liabilities and other	(6,079)	(18,301)
Income taxes, current	(18,856)	53,435
Net cash provided by operating activities	483,758	297,154
Cash flows from investing activities:
Capital expenditures	(218,621)	(207,502)
Proceeds from redemption of marketable securities	172,506	327,779
Purchase of marketable securities and investments	(125,634)	(384,796)
Proceeds from Storage transactions	0	35,338
Proceeds from sale of investment in Shred-it	25,876	578,257
Acquisitions of businesses, net of cash acquired	(19,630)	(151,731)
Other, net	28	4,433
Net cash (used in) provided by investing activities	(165,475)	201,778
Cash flows from financing activities:
Proceeds from issuance of commercial paper, net	99,500	0
Repayment of debt	(250,000)	(16)
Prepaid short-term debt financing fees	(13,949)	0
Proceeds from exercise of stock-based compensation awards	25,114	22,260
Dividends paid	(142,444)	(115,273)
Repurchase of common stock	(20,054)	(502,439)
Other, net	(5,801)	1,153
Net cash used in financing activities	(307,634)	(594,315)
Effect of exchange rate changes on cash and cash equivalents	(2,762)	(6,574)
Net increase (decrease) in cash and cash equivalents	7,887	(101,957)
Cash and cash equivalents at beginning of period	139,357	417,073
Cash and cash equivalents at end of period	$ 147,244	$ 315,116