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Document and Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2018
Aug. 20, 2018
Dec. 31, 2017
Entity Registrant Name PHIBRO ANIMAL HEALTH CORP    
Entity Central Index Key 0001069899    
Trading Symbol pahc    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Current Fiscal Year End Date --06-30    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 654,921,282
Document Type 10-K    
Document Period End Date Jun. 30, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Class A common stock      
Entity Common Stock, Shares Outstanding   20,121,674  
Class B common stock      
Entity Common Stock, Shares Outstanding   20,246,034