Document and Entity Information	6 Months Ended
	Nov. 30, 2012	Dec. 31, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	CINTAS CORP
Entity Central Index Key	0000723254
Document Type	10-Q
Document Period End Date	Nov. 30, 2012
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		123,286,223
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2