Supplemental Guarantor Information (Condensed Consolidated Statements of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended					6 Months Ended
	Nov. 30, 2013		Aug. 31, 2013	Nov. 30, 2012		Nov. 30, 2013		Nov. 30, 2012
Condensed Consolidating Financial Statements
Net income	$ 84,862			$ 78,027		$ 162,616		$ 154,760
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,040			1,675		1,394		8,692
Change in fair value of derivatives	(189)	[1]		0	[1]	(189)	[1]	(151)	[1]
Amortization of interest rate lock agreements	488	[2]		488	[2]	976	[2]	976	[2]
Change in fair value of available-for-sale securities	(4)	[3]		(10)	[3]	(18)	[3]	(12)	[3]
Other comprehensive income	2,335		(172)	2,153		2,163		9,505
Comprehensive income	87,197			80,180		164,779		164,265
Cintas Corporation
Condensed Consolidating Financial Statements
Net income	84,862			78,027		162,616		154,760
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	0			0		0		0
Change in fair value of derivatives	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 income	0			0		0		0
Comprehensive income	84,862			78,027		162,616		154,760
Corp. 2
Condensed Consolidating Financial Statements
Net income	25,272			26,971		50,953		50,563
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(2)			(1)		5		7
Change in fair value of derivatives	0			0				(151)
Amortization of interest rate lock agreements	488			488		976		976
Change in fair value of available-for-sale securities	0			0		0		0
Other comprehensive income	486			487		792		832
Comprehensive income	25,758			27,458		51,745		51,395
Subsidiary Guarantors
Condensed Consolidating Financial Statements
Net income	56,722			53,226		107,679		103,498
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	0			0		0		0
Change in fair value of derivatives	0			0				0
Amortization of interest rate lock agreements	0			0		0		0
Change in fair value of available-for-sale securities	0			(7)		(13)		(7)
Other comprehensive income	0			(7)		(13)		(7)
Comprehensive income	56,722			53,219		107,666		103,491
Non-Guarantors
Condensed Consolidating Financial Statements
Net income	3,272			2,407		19,666		5,939
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,042			1,676		1,389		8,685
Change in fair value of derivatives	(189)			0				0
Amortization of interest rate lock agreements	0			0		0		0
Change in fair value of available-for-sale securities	(4)			(3)		(5)		(5)
Other comprehensive income	1,849			1,673		1,384		8,680
Comprehensive income	5,121			4,080		21,050		14,619
Eliminations
Condensed Consolidating Financial Statements
Net income	(85,266)			(82,604)		(178,298)		(160,000)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	0			0		0		0
Change in fair value of derivatives	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 income	0			0		0		0
Comprehensive income	$ (85,266)			$ (82,604)		$ (178,298)		$ (160,000)

[1] Net of less than $0.1 million of tax expense for the three months ended November 30, 2013. Net of less than $0.1 million of tax expense for the six months ended November 30, 2013 and 2012.

[2] Net of $0.3 million of tax benefit for the three months ended November 30, 2013 and 2012. Net of $0.6 million of tax benefit for the six months ended November 30, 2013 and 2012.

[3] Net of less than $0.1 million of tax expense and $0.1 million of tax benefit for the three months ended November 30, 2013 and 2012, respectively. Net of less than $0.1 million of tax expense and $0.1 million of tax benefit for the six months ended November 30, 2013 and 2012, respectively.