Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Oct. 31, 2018
Nov. 30, 2018
Apr. 30, 2018
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Entity Emerging Growth Company false    
Entity Small Business false    
Document Period End Date Oct. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity Registrant Name COOPER COMPANIES INC    
Entity Central Index Key 0000711404    
Current Fiscal Year End Date --10-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   49,232,061  
Entity Public Float     $ 11.3
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Well-Known Seasoned Issuer Yes    
Entity Shell Company false