Supplemental Guarantor Information (Condensed Consolidated Statements of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Condensed Consolidating Financial Statements
Net income	$ 84,602			$ 74,705	$ 247,218	$ 229,465
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(5,121)			(8,173)	(3,727)	519
Change in fair value of derivatives	(102)			(36)	(291)	(187)
Amortization of interest rate lock agreements	488			488	1,464	1,464
Change in fair value of available-for-sale securities	1			1	(17)	(11)
Other comprehensive (loss) income	(4,734)	2,335	(172)	(7,720)	(2,571)	1,785
Comprehensive income	79,868			66,985	244,647	231,250
Cintas Corporation
Condensed Consolidating Financial Statements
Net income	84,602			74,705	247,218	229,465
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	84,602			74,705	247,218	229,465
Corp. 2
Condensed Consolidating Financial Statements
Net income	23,352			23,197	74,305	73,760
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	0			(7)	0	0
Change in fair value of derivatives	0			(36)	0	(187)
Amortization of interest rate lock agreements	488			488	1,464	1,464
Change in fair value of available-for-sale securities	0			0	0	0
Other comprehensive (loss) income	488			445	1,464	1,277
Comprehensive income	23,840			23,642	75,769	75,037
Subsidiary Guarantors
Condensed Consolidating Financial Statements
Net income	57,938			54,012	165,617	157,510
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			4	(14)	(3)
Other comprehensive (loss) income	0			4	(14)	(3)
Comprehensive income	57,938			54,016	165,603	157,507
Non-Guarantors
Condensed Consolidating Financial Statements
Net income	2,309			(4,054)	21,975	1,885
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(5,121)			(8,166)	(3,727)	519
Change in fair value of derivatives	(102)			0	(291)	0
Amortization of interest rate lock agreements	0			0	0	0
Change in fair value of available-for-sale securities	1			(3)	(3)	(8)
Other comprehensive (loss) income	(5,222)			(8,169)	(4,021)	511
Comprehensive income	(2,913)			(12,223)	17,954	2,396
Eliminations
Condensed Consolidating Financial Statements
Net income	(83,599)			(73,155)	(261,897)	(233,155)
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	0			0	0	0
Other comprehensive (loss) income	0			0	0	0
Comprehensive income	$ (83,599)			$ (73,155)	$ (261,897)	$ (233,155)