Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock option exercises			$ 507	$ 1,062
NQOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	$ 186	$ 92	455	156
Proceeds from stock option exercises			$ 300	$ 800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options granted (shares)			154,263
Number of options exercised (shares)			(28,798)
Number of options forfeited (shares)			(7,991)
Number of options expired (shares)			(879)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average purchase price (in US$ per share)			$ 25.04
Weighted Average Exercise Price, Exercised (in US$ per share)			11.32
Weighted Average Exercise Price, Forfeited (in US$ per share)			30.50
Weighted Average Exercise Price, Expired (in US$ per share)			31.70
Weighted Average Exercise Price, Ending balance (in US$ per share)	$ 27.32		27.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average fair value (in US$ per share)			$ 8.66
Weighted Average Remaining Life, Beginning balance			5 years 11 months 23 days
Weighted Average Remaining Life, Ending balance			5 years 11 months 23 days
Aggregate Intrinsic Value, Beginning balance	$ 78		$ 78		$ 78
Aggregate intrinsic value, exercised			466
Aggregate Intrinsic Value, Ending balance	78		$ 78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options					277,919
NQOs | Vested
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options - Beginning balance (in shares)			161,324
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Beginning balance (in US$ per share)			$ 26.82
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Life, Beginning balance				5 years 1 month 6 days
Weighted Average Remaining Life, Ending balance				5 years 1 month 6 days
Aggregate Intrinsic Value, Beginning balance						$ 741
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Options, Vested and exercisable, Outstanding (in shares)					49,227
Options, Vested and exercisable, Weighted Average Exercise Price (in US$ per share)					$ 27.60
Options, Vested and exercisable, Weighted Average Remaining Contractual Term			4 years 6 months 15 days
Options, Vested and exercisable, Aggregate Intrinsic Value					$ 78
PNQs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock option exercises			$ 100	$ 300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Life, Beginning balance			3 years 3 months 11 days
Weighted Average Remaining Life, Ending balance			3 years 3 months 11 days
PNQs | Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	$ 100	$ 200	$ 300	$ 600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options - Beginning balance (in shares)			300,708
Number of options granted (shares)			0
Number of options exercised (shares)			(5,806)
Number of options forfeited (shares)			(6,916)
Number of options expired (shares)			(14,490)
Number of options - Ending balance (in shares)	273,496		273,496
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Beginning balance (in US$ per share)			$ 27.08
Weighted average purchase price (in US$ per share)			0.00
Weighted Average Exercise Price, Exercised (in US$ per share)			22.70
Weighted Average Exercise Price, Forfeited (in US$ per share)			31.43
Weighted Average Exercise Price, Expired (in US$ per share)			27.50
Weighted Average Exercise Price, Ending balance (in US$ per share)	$ 27.04		$ 27.04
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Life, Beginning balance				4 years
Weighted Average Remaining Life, Ending balance				4 years
Aggregate Intrinsic Value, Beginning balance						$ 1,207
Aggregate intrinsic value, exercised			$ 17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Options, Vested and exercisable, Outstanding (in shares)					251,933
Options, Vested and exercisable, Weighted Average Exercise Price (in US$ per share)					$ 26.55
Options, Vested and exercisable, Weighted Average Remaining Contractual Term			3 years 1 month 30 days