Cover Page - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Sep. 01, 2020	Dec. 31, 2019
Cover [Abstract]
Document Type	10-K
Document Transition Report	false
Document Annual Report	true
Entity File Number	001-34249
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-0725980
Document Period End Date	Jun. 30, 2020
Entity Registrant Name	FARMER BROTHERS CO
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, $1.00 par value
Trading Symbol	FARM
Entity Public Float			$ 119.7
Entity Common Stock, Shares Outstanding		17,426,497
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Entity Central Index Key	0000034563
Current Fiscal Year End Date	--06-30
Amendment Flag	false
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	888
Local Phone Number	998-2468
Security Exchange Name	NASDAQ
ICFR Auditor Attestation Flag	true