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Cover - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2024
Oct. 01, 2024
Dec. 31, 2023
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Jun. 30, 2024    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Current Fiscal Year End Date --06-30    
Entity File Number 001-34249    
Entity Registrant Name FARMER BROTHERS CO    
Entity Central Index Key 0000034563    
Entity Tax Identification Number 95-0725980    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 14501 N Fwy    
Entity Address, City or Town Fort Worth    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 76177    
City Area Code 682    
Local Phone Number 549-6600    
Title of 12(b) Security Common Stock, par value $1.00 per share    
Trading Symbol FARM    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 47.6
Entity Common Stock, Shares Outstanding   21,268,223  
ICFR Auditor Attestation Flag true    
Auditor Firm ID 248    
Auditor Name GRANT THORNTON LLP    
Auditor Location Dallas, Texas