Supplemental Guarantor Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Feb. 28, 2013		Feb. 29, 2012		Feb. 28, 2013		Feb. 29, 2012
Condensed Consolidating Financial Statements
Net income	$ 74,705		$ 76,035		$ 229,465		$ 219,023
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(8,173)		11,203		519		(9,343)
Change in fair value of derivatives	(36)	[1]	304	[1]	(187)	[1]	485	[1]
Amortization of interest rate lock agreements	488		377		1,464		1,131
Change in fair value of available-for-sale securities	1	[2]	(29)	[2]	(11)	[2]	(4)	[2]
Other comprehensive (loss) income	(7,720)		11,855		1,785		(7,731)
Comprehensive income	66,985		87,890		231,250		211,292
Cintas Corporation [Member]
Condensed Consolidating Financial Statements
Net income	74,705		76,035		229,465		219,023
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0		0		0		0
Change in fair value of derivatives	0		0		0		0
Amortization of interest rate lock agreements	0		0		0		0
Change in fair value of available-for-sale securities	0		0		0		0
Other comprehensive (loss) income	0		0		0		0
Comprehensive income	74,705		76,035		229,465		219,023
Corp. 2 [Member]
Condensed Consolidating Financial Statements
Net income	23,197		9,957		73,760		72,968
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(7)		20		0		(15)
Change in fair value of derivatives	(36)		(27)		(187)		180
Amortization of interest rate lock agreements	488		377		1,464		1,131
Change in fair value of available-for-sale securities	0		0		0		0
Other comprehensive (loss) income	445		370		1,277		1,296
Comprehensive income	23,642		10,327		75,037		74,264
Subsidiary Guarantors [Member]
Condensed Consolidating Financial Statements
Net income	54,012		57,607		157,510		135,155
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0		0		0		0
Change in fair value of derivatives	0		0		0		0
Amortization of interest rate lock agreements	0		0		0		0
Change in fair value of available-for-sale securities	4		0		(3)		0
Other comprehensive (loss) income	4		0		(3)		0
Comprehensive income	54,016		57,607		157,507		135,155
Non-Guarantors [Member]
Condensed Consolidating Financial Statements
Net income	(4,054)		2,766		1,885		7,827
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(8,166)		11,183		519		(9,328)
Change in fair value of derivatives	0		331		0		305
Amortization of interest rate lock agreements	0		0		0		0
Change in fair value of available-for-sale securities	(3)		(29)		(8)		(4)
Other comprehensive (loss) income	(8,169)		11,485		511		(9,027)
Comprehensive income	(12,223)		14,251		2,396		(1,200)
Eliminations [Member]
Condensed Consolidating Financial Statements
Net income	(73,155)		(70,330)		(233,155)		(215,950)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0		0		0		0
Change in fair value of derivatives	0		0		0		0
Amortization of interest rate lock agreements	0		0		0		0
Change in fair value of available-for-sale securities	0		0		0		0
Other comprehensive (loss) income	0		0		0		0
Comprehensive income	$ (73,155)		$ (70,330)		$ (233,155)		$ (215,950)

[1] Net of $0.2 million of tax benefit for the three months ended February 29, 2012. Net of less than $0.1 million of tax expense and $0.3 million of tax benefit for the nine months ended February 28, 2013 and February 29, 2012, respectively.

[2] Net of less than $0.1 million of tax benefit and $0.1 million of tax expense for the three months ended February 28, 2013 and February 29, 2012, respectively. Net of less than $0.1 million of tax benefit and $0.1 million of tax expense for the nine months ended February 28, 2013 and February 29, 2012, respectively.