XML 26 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2019
May 31, 2019
Oct. 31, 2018
Entity Information [Line Items]      
Entity Registrant Name WILEY JOHN & SONS, INC.    
Entity Central Index Key 0000107140    
Current Fiscal Year End Date --04-30    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Ex Transition Period false    
Entity Public Float     $ 2,465
Document Type 10-K    
Amendment Flag false    
Document Period End Date Apr. 30, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Common Stock Class A [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   47,499,550  
Common Stock Class B [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   9,132,133