Supplemental Guarantor Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Nov. 30, 2012		Nov. 30, 2011		Nov. 30, 2012		Nov. 30, 2011
Condensed Consolidating Financial Statements
Net income	$ 78,027		$ 74,350		$ 154,760		$ 142,988
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	1,675		(20,764)		8,692		(20,546)
Change in fair value of derivatives(1)	0	[1]	27	[1]	(151)	[1]	181	[1]
Amortization of interest rate lock agreements	488		377		976		754
Change in fair value of available-for-sale securities(2)	(10)	[2]	7	[2]	(12)	[2]	25	[2]
Other comprehensive income	2,153		(20,353)		9,505		(19,586)
Comprehensive income	80,180		53,997		164,265		123,402
Cintas Corporation [Member]
Condensed Consolidating Financial Statements
Net income	78,027		74,350		154,760		142,988
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	0		0		0		0
Change in fair value of derivatives(1)	0		0		0		0
Amortization of interest rate lock agreements	0		0		0		0
Change in fair value of available-for-sale securities(2)	0		0		0		0
Other comprehensive income	0		0		0		0
Comprehensive income	78,027		74,350		154,760		142,988
Corp. 2 [Member]
Condensed Consolidating Financial Statements
Net income	26,971		31,118		50,563		63,011
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(1)		(34)		7		(35)
Change in fair value of derivatives(1)	0		124		(151)		207
Amortization of interest rate lock agreements	488		377		976		754
Change in fair value of available-for-sale securities(2)	0		0		0		0
Other comprehensive income	487		467		832		926
Comprehensive income	27,458		31,585		51,395		63,937
Subsidiary Guarantors [Member]
Condensed Consolidating Financial Statements
Net income	53,226		38,840		103,498		77,548
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	0		0		0		0
Change in fair value of derivatives(1)	0		0		0		0
Amortization of interest rate lock agreements	0		0		0		0
Change in fair value of available-for-sale securities(2)	(7)		0		(7)		0
Other comprehensive income	(7)		0		(7)		0
Comprehensive income	53,219		38,840		103,491		77,548
Non-Guarantors [Member]
Condensed Consolidating Financial Statements
Net income	2,407		189		5,939		5,061
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	1,676		(20,730)		8,685		(20,511)
Change in fair value of derivatives(1)	0		(97)		0		(26)
Amortization of interest rate lock agreements	0		0		0		0
Change in fair value of available-for-sale securities(2)	(3)		7		(5)		25
Other comprehensive income	1,673		(20,820)		8,680		(20,512)
Comprehensive income	4,080		(20,631)		14,619		(15,451)
Eliminations [Member]
Condensed Consolidating Financial Statements
Net income	(82,604)		(70,147)		(160,000)		(145,620)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	0		0		0		0
Change in fair value of derivatives(1)	0		0		0		0
Amortization of interest rate lock agreements	0		0		0		0
Change in fair value of available-for-sale securities(2)	0		0		0		0
Other comprehensive income	0		0		0		0
Comprehensive income	$ (82,604)		$ (70,147)		$ (160,000)		$ (145,620)

[1] Net of less than $0.1 million of tax benefit for the three months ended November 30, 2011. Net of less than $0.1 million of tax expense and $0.1 million of tax benefit for the six months ended November 30, 2012 and 2011, respectively.

[2] Net of less than $0.1 million of tax benefit for the three months ended November 30, 2012 and 2011, respectively. Net of less than $0.1 million of tax benefit for both the six months ended November 30, 2012 and 2011, respectively.