Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
12 Months Ended
May 31, 2012
Jun. 30, 2012
Nov. 30, 2011
Document and Entity Information [Abstract]      
Entity Registrant Name PAYCHEX INC    
Entity Central Index Key 0000723531    
Document Type 10-K    
Document Period End Date May 31, 2012    
Amendment Flag false    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
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     $ 9,428,956,553
Entity Common Stock, Shares Outstanding   362,758,777