Supplemental Guarantor Information - Condensed Consolidating Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	May. 31, 2015		Feb. 28, 2015	[1],[2],[3]	Nov. 30, 2014	[1],[2],[3]	Aug. 31, 2014		May. 31, 2014	[1],[3],[4]	Feb. 28, 2014		Nov. 30, 2013	[1],[3],[4]	Aug. 31, 2013	[1],[3],[4]	May. 31, 2015	May. 31, 2014	May. 31, 2013
Revenue:
Rental uniforms and ancillary products																	$ 3,454,956	$ 3,223,930	$ 3,044,587
Other services																	1,021,930	1,245,635	1,201,377
Equity in net income of affiliates																	0	0	0
Total revenue	$ 1,142,583	[1],[2],[3]	$ 1,108,847		$ 1,123,379		$ 1,102,077	[1],[2],[3]	$ 1,134,415		$ 1,110,973	[1],[3],[4]	$ 1,123,931		$ 1,100,246		4,476,886	4,469,565	4,245,964
Costs and expenses (income):
Cost of rental uniforms and ancillary products																	1,913,466	1,829,427	1,756,297
Cost of other services																	642,083	766,484	736,358
Selling and administrative expenses																	1,224,930	1,264,836	1,187,331
Shredding Transaction asset impairment charge																	0	16,143	0
Shredding Transaction costs											2,200						0	28,481	0
Operating income																	696,407	564,194	565,978
Gain on deconsolidation of Shredding	(1,000)						4,100										4,952	106,441	0
Gain on sale of stock of an equity method investment																	21,739	0	0
Interest income																	(339)	(229)	(409)
Interest expense (income)																	65,161	65,822	65,712
Income before income taxes																	658,276	605,042	500,675
Income taxes																	244,660	231,991	184,089
Gain (loss) on investment in Shred-it, net of tax																	(5,539)	1,234	0
Income from continuing operations	$ 101,204	[1],[2],[3]	$ 93,636		$ 103,446		$ 109,791	[1],[2],[3]	$ 128,105		$ 84,326	[1],[3],[4]	$ 84,456		$ 77,398		408,077	374,285	316,586
Income (loss) from discontinued operations, net of tax																	22,541	157	(1,144)
Net income																	430,618	374,442	315,442
Cintas Corporation
Revenue:
Rental uniforms and ancillary products																	0	0	0
Other services																	0	0	0
Equity in net income of affiliates																	408,077	374,285	316,586
Total revenue																	408,077	374,285	316,586
Costs and expenses (income):
Cost of rental uniforms and ancillary products																	0	0	0
Cost of other services																	0	0	0
Selling and administrative expenses																	0	0	0
Shredding Transaction asset impairment charge																		0
Shredding Transaction costs																		0
Operating income																	408,077	374,285	316,586
Gain on deconsolidation of Shredding																	0	0
Gain on sale of stock of an equity method investment																	0
Interest income																	0	0	0
Interest expense (income)																	0	0	0
Income before income taxes																	408,077	374,285	316,586
Income taxes																	0	0	0
Gain (loss) on investment in Shred-it, net of tax																	0	0
Income from continuing operations																	408,077	374,285	316,586
Income (loss) from discontinued operations, net of tax																	22,541	157	(1,144)
Net income																	430,618	374,442	315,442
Corp. 2
Revenue:
Rental uniforms and ancillary products																	2,657,177	2,460,666	2,314,386
Other services																	1,421,861	1,600,265	1,552,687
Equity in net income of affiliates																	0	0	0
Total revenue																	4,079,038	4,060,931	3,867,073
Costs and expenses (income):
Cost of rental uniforms and ancillary products																	1,600,457	1,520,893	1,454,791
Cost of other services																	949,694	1,041,990	1,000,471
Selling and administrative expenses																	1,276,745	1,282,356	1,192,205
Shredding Transaction asset impairment charge																		0
Shredding Transaction costs																		0
Operating income																	252,142	215,692	219,606
Gain on deconsolidation of Shredding																	4,952	111,661
Gain on sale of stock of an equity method investment																	0
Interest income																	(12)	(43)	(40)
Interest expense (income)																	66,298	66,461	66,584
Income before income taxes																	190,808	260,935	153,062
Income taxes																	68,516	99,789	54,350
Gain (loss) on investment in Shred-it, net of tax																	(5,123)	1,141
Income from continuing operations																	117,169	162,287	98,712
Income (loss) from discontinued operations, net of tax																	17,692	(24)	36
Net income																	134,861	162,263	98,748
Subsidiary Guarantors
Revenue:
Rental uniforms and ancillary products																	719,122	663,512	616,726
Other services																	31,222	31,511	31,210
Equity in net income of affiliates																	0	0	0
Total revenue																	750,344	695,023	647,936
Costs and expenses (income):
Cost of rental uniforms and ancillary products																	441,171	417,388	392,134
Cost of other services																	(17,547)	(15,441)	(12,440)
Selling and administrative expenses																	(100,025)	(81,765)	(66,640)
Shredding Transaction asset impairment charge																		16,143
Shredding Transaction costs																		28,481
Operating income																	426,745	330,217	334,882
Gain on deconsolidation of Shredding																	0	0
Gain on sale of stock of an equity method investment																	21,739
Interest income																	(250)	(178)	(272)
Interest expense (income)																	(1,134)	(635)	(875)
Income before income taxes																	449,868	331,030	336,029
Income taxes																	168,708	126,021	119,302
Gain (loss) on investment in Shred-it, net of tax																	0	0
Income from continuing operations																	281,160	205,009	216,727
Income (loss) from discontinued operations, net of tax																	0	0	0
Net income																	281,160	205,009	216,727
Non- Guarantors
Revenue:
Rental uniforms and ancillary products																	215,491	220,969	220,946
Other services																	71,249	86,263	88,040
Equity in net income of affiliates																	0	0	0
Total revenue																	286,740	307,232	308,986
Costs and expenses (income):
Cost of rental uniforms and ancillary products																	148,075	153,726	155,490
Cost of other services																	44,153	54,426	55,703
Selling and administrative expenses																	74,524	82,348	81,671
Shredding Transaction asset impairment charge																		0
Shredding Transaction costs																		0
Operating income																	19,988	16,732	16,122
Gain on deconsolidation of Shredding																	0	(5,220)
Gain on sale of stock of an equity method investment																	0
Interest income																	(79)	(15,279)	(28,334)
Interest expense (income)																	(3)	(4)	3
Income before income taxes																	20,070	26,795	44,453
Income taxes																	7,502	6,260	10,480
Gain (loss) on investment in Shred-it, net of tax																	(416)	93
Income from continuing operations																	12,152	20,628	33,973
Income (loss) from discontinued operations, net of tax																	4,849	181	(1,180)
Net income																	17,001	20,809	32,793
Eliminations
Revenue:
Rental uniforms and ancillary products																	(136,834)	(121,217)	(107,471)
Other services																	(502,402)	(472,404)	(470,560)
Equity in net income of affiliates																	(408,077)	(374,285)	(316,586)
Total revenue																	(1,047,313)	(967,906)	(894,617)
Costs and expenses (income):
Cost of rental uniforms and ancillary products																	(276,237)	(262,580)	(246,118)
Cost of other services																	(334,217)	(314,491)	(307,376)
Selling and administrative expenses																	(26,314)	(18,103)	(19,905)
Shredding Transaction asset impairment charge																		0
Shredding Transaction costs																		0
Operating income																	(410,545)	(372,732)	(321,218)
Gain on deconsolidation of Shredding																	0	0
Gain on sale of stock of an equity method investment																	0
Interest income																	2	15,271	28,237
Interest expense (income)																	0	0	0
Income before income taxes																	(410,547)	(388,003)	(349,455)
Income taxes																	(66)	(79)	(43)
Gain (loss) on investment in Shred-it, net of tax																	0	0
Income from continuing operations																	(410,481)	(387,924)	(349,412)
Income (loss) from discontinued operations, net of tax																	(22,541)	(157)	1,144
Net income																	$ (433,022)	$ (388,081)	$ (348,268)

[1] As a result of the Shredding Transaction, Cintas no longer includes Shredding results in its reported revenue, gross margin and operating income. After April 30, 2014, Cintas recognized its share of the Shred-it Partnership income, net of tax, in net income from continuing operations and diluted earnings per share ("EPS") from continuing operations. As a result of its investment in the Shred-it Partnership, Cintas recognized a net loss of $5.5 million and a net gain of $1.2 million during the years end May 31, 2015 and 2014, respectively.

[2] During the fiscal 2015 first quarter, Cintas recognized a gain on the sale of stock in an equity method investment in the net amount of $13.6 million. In the fiscal 2015 first quarter, Cintas also recorded an net gain of $4.1 million, related to the Shredding Transaction completed in fiscal 2014 as a result of receiving certain additional proceeds. Finally, in the fourth quarter of fiscal 2015, Cintas recorded a net loss of $1.0 million related to the Shredding Transaction completed in fiscal 2014 due to the settlement of an outstanding Shredding-related legal claim.

[3] The figures for both fiscal 2015 and 2014 reflect the change in classification of Storage to discontinued operations within the Consolidated Statements of Income. See Note 17 entitled Discontinued Operations for additional information.

[4] In accordance with GAAP, the fiscal 2014 Shredding revenue, gross margin, operating income, net income and EPS must continue to be included in the reported fiscal 2014 results because of Cintas' continuing ownership in the Shred-it Partnership. In addition, the fiscal 2014 results also included the following related to the Shredding Transaction: a $106.4 million gain on deconsolidation of Shredding, an asset impairment charge of $16.1 million and transaction costs of $28.5 million. All of these impacts were recorded in the fourth quarter except for $2.2 million of transaction costs that were recorded in the third quarter. Please see Note 9 entitled Acquisitions and Deconsolidations for additional information on the transaction.