Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2018	Feb. 08, 2019
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2019
Trading Symbol	FARM
Entity Registrant Name	FARMER BROTHERS CO
Entity Central Index Key	0000034563
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		17,002,529