Cover - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Oct. 01, 2023	Dec. 31, 2022
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	Farmer Bros. Co. ("Farmer Bros." or the "Company") is filing this Amendment No. 1 on Form 10-K/A (this "Amendment") to its Form 10-K for the fiscal year ended June 30, 2023, which was filed with the Securities and Exchange Commission (the "SEC") on September 12, 2023 (the "Original Filing").
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2023
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
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	1912 Farmer Brothers Drive
Entity Address, City or Town	Northlake
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	76262
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	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 96.3
Entity Common Stock, Shares Outstanding		19,279,970
ICFR Auditor Attestation Flag	true
Auditor Name	Grant Thornton LLP
Auditor Location	Dallas, Texas
Auditor Firm ID	248