Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 95,111	$ 79,819	$ 79,189
Farmer Brothers Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	90,508	75,904	75,411
Hourly Employees’ Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	4,603	3,915	$ 3,778
Level 1 | Farmer Brothers Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Level 1 | Hourly Employees’ Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Level 2 | Farmer Brothers Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Level 2 | Hourly Employees’ Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Level 3 | Farmer Brothers Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Level 3 | Hourly Employees’ Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Fair Value Measured at Net Asset Value Per Share | Farmer Brothers Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	90,508	75,904
Fair Value Measured at Net Asset Value Per Share | Hourly Employees’ Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 4,603	$ 3,915