Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Farmer Brothers Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 97,304	$ 91,201	$ 94,815
Farmer Brothers Plan | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Farmer Brothers Plan | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	97,304	91,201
Farmer Brothers Plan | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Brewmatic Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	3,115	2,989	3,291
Brewmatic Plan | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Brewmatic Plan | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	3,115	2,989
Brewmatic Plan | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Hourly Employees’ Plan
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	2,999	2,447	$ 2,104
Hourly Employees’ Plan | Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	0	0
Hourly Employees’ Plan | Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	2,999	2,447
Hourly Employees’ Plan | Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 0	$ 0