Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.8.0.1
Document and Entity Information - shares
3 Months Ended
Aug. 31, 2017
Sep. 30, 2017
Document and Entity Information [Abstract]    
Entity Registrant Name PAYCHEX INC  
Entity Filer Category Large Accelerated Filer  
Entity Central Index Key 0000723531  
Amendment Flag false  
Document Type 10-Q  
Trading Symbol PAYX  
Document Fiscal Period Focus Q1  
Document Period End Date Aug. 31, 2017  
Document Fiscal Year Focus 2018  
Current Fiscal Year End Date --05-31  
Entity Common Stock, Shares Outstanding   358,994,637