Cover - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2025	Oct. 01, 2025	Dec. 31, 2024
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2025
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
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			$ 30.4
Entity Common Stock, Shares Outstanding		21,602,012
ICFR Auditor Attestation Flag	true
Auditor Firm ID	248
Auditor Name	GRANT THORNTON LLP
Auditor Location	Dallas, Texas