Supplemental Guarantor Information (Condensed Consolidated Statements of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2013		Aug. 31, 2012
Condensed Consolidating Financial Statements
Net income	$ 77,754		$ 76,733
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(646)		7,017
Change in fair value of derivatives	0	[1]	(151)	[1]
Amortization of interest rate lock agreements	488	[2]	488	[2]
Change in fair value of available-for-sale securities	(14)	[3]	(2)	[3]
Other comprehensive (loss) income	(172)		7,352
Comprehensive income	77,582		84,085
Cintas Corporation [Member]
Condensed Consolidating Financial Statements
Net income	77,754		76,733
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0		0
Change in fair value of derivatives			0
Amortization of interest rate lock agreements	0		0
Change in fair value of available-for-sale securities	0		0
Other comprehensive (loss) income	0		0
Comprehensive income	77,754		76,733
Corp. 2 [Member]
Condensed Consolidating Financial Statements
Net income	25,681		23,592
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	7		8
Change in fair value of derivatives			(151)
Amortization of interest rate lock agreements	488		488
Change in fair value of available-for-sale securities	0		0
Other comprehensive (loss) income	495		345
Comprehensive income	26,176		23,937
Subsidiary Guarantors [Member]
Condensed Consolidating Financial Statements
Net income	50,957		50,272
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0		0
Change in fair value of derivatives			0
Amortization of interest rate lock agreements	0		0
Change in fair value of available-for-sale securities	(13)		0
Other comprehensive (loss) income	(13)		0
Comprehensive income	50,944		50,272
Non-Guarantors [Member]
Condensed Consolidating Financial Statements
Net income	16,394		3,532
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(653)		7,009
Change in fair value of derivatives			0
Amortization of interest rate lock agreements	0		0
Change in fair value of available-for-sale securities	(1)		(2)
Other comprehensive (loss) income	(654)		7,007
Comprehensive income	15,740		10,539
Eliminations [Member]
Condensed Consolidating Financial Statements
Net income	(93,032)		(77,396)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0		0
Change in fair value of derivatives			0
Amortization of interest rate lock agreements	0		0
Change in fair value of available-for-sale securities	0		0
Other comprehensive (loss) income	0		0
Comprehensive income	$ (93,032)		$ (77,396)

[1] Net of less than $0.1 million of tax expense for the three months ended August 31, 2012

[2] Net of less than $0.1 million of tax benefit for the three months ended August 31, 2013 and 2012, respectively.

[3] Net of less than $0.1 million of tax expense for the three months ended August 31, 2013 and 2012, respectively.