Document and Entity Information (USD $)	12 Months Ended
	May 31, 2014	Jun. 30, 2014	Nov. 29, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	CINTAS CORP
Entity Central Index Key	0000723254
Document Type	10-K
Document Period End Date	May 31, 2014
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 6,649,843,722
Entity Common Stock, Shares Outstanding		116,403,688
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY