Supplemental Guarantor Information (Condensed Consolidating Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Cash flows from operating activities:
Net income	$ 247,218	$ 229,465
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	127,761	123,242
Amortization of intangible assets	17,524	17,884
Stock-based compensation	22,248	16,660
Deferred income taxes	8,733	31,905
Change in current assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	(34,024)	(41,402)
Inventories, net	(16,130)	4,437
Uniforms and other rental items in service	(4,142)	(28,803)
Prepaid expenses	(1,892)	9
Accounts payable	(7,037)	13,475
Accrued compensation and related liabilities	2,219	(680)
Accrued liabilities	5,025	(3,788)
Income taxes payable	18,270	5,939
Net cash provided by operating activities	385,773	368,343
Cash flows from investing activities:
Capital expenditures	(113,615)	(151,799)
Proceeds from redemption of marketable securities	49,635	97,651
Purchase of marketable securities and investments	(63,335)	(135,398)
Acquisitions of businesses, net of cash acquired	(32,965)	(64,625)
Other, net	(868)	(662)
Net cash used in investing activities	(161,148)	(254,833)
Cash flows from financing activities:
Proceeds from issuance of debt	0	250,000
Repayment of debt	(8,010)	(225,472)
Exercise of stock-based compensation awards	29,286	7,156
Dividends paid	(93,314)	(79,744)
Repurchase of common stock	(164,462)	(187,076)
Other, net	10,339	(1,385)
Net cash used in financing activities	(226,161)	(236,521)
Effect of exchange rate changes on cash and cash equivalents	(1,878)	656
Net decrease in cash and cash equivalents	(3,414)	(122,355)
Cash and cash equivalents at beginning of period	352,273	339,825
Cash and cash equivalents at end of period	348,859	217,470
Cintas Corporation
Cash flows from operating activities:
Net income	247,218	229,465
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	0	0
Amortization of intangible assets	0	0
Stock-based compensation	22,248	16,660
Deferred income taxes	0	0
Change in current assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	0	0
Inventories, net	0	0
Uniforms and other rental items in service	0	0
Prepaid expenses	0	0
Accounts payable	0	0
Accrued compensation and related liabilities	0	0
Accrued liabilities	0	0
Income taxes payable	0	0
Net cash provided by operating activities	269,466	246,125
Cash flows from investing activities:
Capital expenditures	0	0
Proceeds from redemption of marketable securities	0	0
Purchase of marketable securities and investments		0
Acquisitions of businesses, net of cash acquired	0	0
Other, net	(45,138)	10,653
Net cash used in investing activities	(45,138)	10,653
Cash flows from financing activities:
Proceeds from issuance of debt	0	0
Repayment of debt	0	0
Exercise of stock-based compensation awards	29,286	7,156
Dividends paid	(93,287)	(79,723)
Repurchase of common stock	(164,462)	(187,076)
Other, net	4,135	2,865
Net cash used in financing activities	(224,328)	(256,778)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Corp. 2
Cash flows from operating activities:
Net income	74,305	73,760
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	77,225	73,048
Amortization of intangible assets	15,913	15,681
Stock-based compensation	0	0
Deferred income taxes	(1)	(1)
Change in current assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	(29,274)	(14,247)
Inventories, net	(23,320)	2,563
Uniforms and other rental items in service	(3,796)	(14,395)
Prepaid expenses	475	623
Accounts payable	(43,563)	(61,702)
Accrued compensation and related liabilities	3,338	456
Accrued liabilities	(19,708)	(25,003)
Income taxes payable	18,413	15,762
Net cash provided by operating activities	70,007	66,545
Cash flows from investing activities:
Capital expenditures	(77,219)	(92,342)
Proceeds from redemption of marketable securities	0	0
Purchase of marketable securities and investments	(1,051)	(865)
Acquisitions of businesses, net of cash acquired	(12,783)	(62,693)
Other, net	45,472	57,393
Net cash used in investing activities	(45,581)	(98,507)
Cash flows from financing activities:
Proceeds from issuance of debt	0	250,000
Repayment of debt	(8,259)	(225,702)
Exercise of stock-based compensation awards	0	0
Dividends paid	0	0
Repurchase of common stock	0	0
Other, net	1,464	(4,477)
Net cash used in financing activities	(6,795)	19,821
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	17,631	(12,141)
Cash and cash equivalents at beginning of period	54,511	58,737
Cash and cash equivalents at end of period	72,142	46,596
Subsidiary Guarantors
Cash flows from operating activities:
Net income	165,617	157,510
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	39,574	40,025
Amortization of intangible assets	122	158
Stock-based compensation	0	0
Deferred income taxes	8,806	31,169
Change in current assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	(5,078)	(26,217)
Inventories, net	6,385	(4,556)
Uniforms and other rental items in service	1,246	(8,876)
Prepaid expenses	(3,964)	(1,769)
Accounts payable	33,239	70,654
Accrued compensation and related liabilities	(576)	(1,407)
Accrued liabilities	26,620	21,069
Income taxes payable	(2,629)	(14,114)
Net cash provided by operating activities	269,362	263,646
Cash flows from investing activities:
Capital expenditures	(26,646)	(40,817)
Proceeds from redemption of marketable securities	5,659	10,810
Purchase of marketable securities and investments	(57,460)	(32,340)
Acquisitions of businesses, net of cash acquired	0	0
Other, net	(204,788)	(292,054)
Net cash used in investing activities	(283,235)	(354,401)
Cash flows from financing activities:
Proceeds from issuance of debt	4,416	0
Repayment of debt	1,016	1,016
Exercise of stock-based compensation awards	0	0
Dividends paid	0	0
Repurchase of common stock	0	0
Other, net	0	0
Net cash used in financing activities	5,432	1,016
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	(8,441)	(89,739)
Cash and cash equivalents at beginning of period	247,070	229,287
Cash and cash equivalents at end of period	238,629	139,548
Non-Guarantors
Cash flows from operating activities:
Net income	21,975	1,885
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	10,962	10,169
Amortization of intangible assets	1,489	2,045
Stock-based compensation	0	0
Deferred income taxes	(72)	737
Change in current assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	328	(938)
Inventories, net	534	(153)
Uniforms and other rental items in service	(732)	(2,528)
Prepaid expenses	1,597	1,155
Accounts payable	3,288	4,523
Accrued compensation and related liabilities	(543)	271
Accrued liabilities	(2,654)	(640)
Income taxes payable	2,486	4,291
Net cash provided by operating activities	38,658	20,817
Cash flows from investing activities:
Capital expenditures	(9,750)	(18,640)
Proceeds from redemption of marketable securities	43,976	86,841
Purchase of marketable securities and investments	(49,051)	(109,870)
Acquisitions of businesses, net of cash acquired	(20,182)	(1,932)
Other, net	(14,674)	1,447
Net cash used in investing activities	(49,681)	(42,154)
Cash flows from financing activities:
Proceeds from issuance of debt	(4,416)	0
Repayment of debt	0	0
Exercise of stock-based compensation awards	0	0
Dividends paid	(27)	(21)
Repurchase of common stock	0	0
Other, net	4,740	227
Net cash used in financing activities	297	206
Effect of exchange rate changes on cash and cash equivalents	(1,878)	656
Net decrease in cash and cash equivalents	(12,604)	(20,475)
Cash and cash equivalents at beginning of period	50,692	51,801
Cash and cash equivalents at end of period	38,088	31,326
Eliminations
Cash flows from operating activities:
Net income	(261,897)	(233,155)
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation	0	0
Amortization of intangible assets	0	0
Stock-based compensation	0	0
Deferred income taxes	0	0
Change in current assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	0	0
Inventories, net	271	6,583
Uniforms and other rental items in service	(860)	(3,004)
Prepaid expenses	0	0
Accounts payable	(1)	0
Accrued compensation and related liabilities	0	0
Accrued liabilities	767	786
Income taxes payable	0	0
Net cash provided by operating activities	(261,720)	(228,790)
Cash flows from investing activities:
Capital expenditures	0	0
Proceeds from redemption of marketable securities	0	0
Purchase of marketable securities and investments	44,227	7,677
Acquisitions of businesses, net of cash acquired	0	0
Other, net	218,260	221,899
Net cash used in investing activities	262,487	229,576
Cash flows from financing activities:
Proceeds from issuance of debt	0	0
Repayment of debt	(767)	(786)
Exercise of stock-based compensation awards	0	0
Dividends paid	0	0
Repurchase of common stock	0	0
Other, net	0	0
Net cash used in financing activities	(767)	(786)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0