Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
May. 31, 2015
Jun. 30, 2015
Nov. 30, 2014
Entity Information [Line Items]      
Entity Registrant Name PAYCHEX INC    
Entity Central Index Key 0000723531    
Document Type 10-K    
Document Period End Date May 31, 2015    
Amendment Flag false    
Document Fiscal Year Focus 2015    
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     $ 15,395,911,785
Entity Common Stock, Shares Outstanding   361,206,331