Cover Page - shares	9 Months Ended
	Mar. 31, 2020	Apr. 30, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-34249
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-0725980
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
Title of 12(b) Security	Common Stock, $1.00 par value
Trading Symbol	FARM
Security Exchange Name	NASDAQ
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 Common Stock, Shares Outstanding		17,335,720
Entity Registrant Name	FARMER BROTHERS CO
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000034563
Document Fiscal Year Focus	2020