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Document and Entity Information - shares
 6 Months Ended
Dec. 31, 2017
Jan. 29, 2018
Entity Registrant Name PHIBRO ANIMAL HEALTH CORP  
Entity Central Index Key 0001069899  
Trading Symbol pahc  
Current Fiscal Year End Date --06-30  
Entity Filer Category Accelerated Filer  
Document Type 10-Q  
Document Period End Date Dec. 31, 2017  
Amendment Flag false  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Class A common stock    
Entity Common Stock, Shares Outstanding   19,589,889
Class B common stock    
Entity Common Stock, Shares Outstanding   20,602,836