Employee Benefit Plans - Change in Projected Benefit Obligation, Plan Assets and Net Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Amounts recognized in consolidated balance sheets
Current liabilities	$ (3,956)	$ (347)
Weighted average assumptions used to determine benefit obligations
Discount rate	4.10%
Other Postretirement Benefits Plan
Change in projected benefit obligation
Benefit obligation at the beginning of the year	$ 21,867	24,522
Service cost	760	1,388	$ 1,195
Interest cost	829	1,194	943
Participant contributions	741	795
Actuarial (gain) loss	(2,377)	(4,259)
Benefits paid	(1,140)	(1,773)
Projected benefit obligation at the end of the year	20,680	21,867	24,522
Change in plan assets
Fair value of plan assets at the beginning of the year	0	0
Employer contributions	399	978
Participant contributions	741	795
Benefits paid	(1,140)	(1,773)
Fair value of plan assets at the end of the year	0	0	0
Funded status at end of year (underfunded) overfunded	(20,680)	(21,867)
Amounts recognized in consolidated balance sheets
Non-current assets	0	0
Current liabilities	(893)	(1,060)
Noncurrent liabilities	(19,787)	(20,807)
Amounts Recognized in Balance Sheet	(20,680)	(21,867)
Farmer Brothers Plan
Change in projected benefit obligation
Benefit obligation at the beginning of the year	152,325	136,962
Service cost	0	0
Interest cost	5,277	5,875
Actuarial (gain) loss	(4,556)	15,999
Benefits paid	(6,755)	(6,511)
Projected benefit obligation at the end of the year	146,291	152,325	136,962
Change in plan assets
Fair value of plan assets at the beginning of the year	91,201	94,815
Actual return on plan assets	10,874	1,556
Employer contributions	1,984	1,341
Benefits paid	(6,755)	(6,511)
Fair value of plan assets at the end of the year	97,304	91,201	94,815
Funded status at end of year (underfunded) overfunded	(48,987)	(61,124)
Amounts recognized in consolidated balance sheets
Noncurrent liabilities	(48,987)	(61,124)
Amounts Recognized in Balance Sheet	(48,987)	(61,124)
Amounts recognized in balance sheet
Net loss	59,007	70,246
Total accumulated OCI (not adjusted for applicable tax)	$ 59,007	$ 70,246
Weighted average assumptions used to determine benefit obligations
Discount rate	3.80%	3.55%
Brewmatic Plan
Change in projected benefit obligation
Benefit obligation at the beginning of the year	$ 4,574	$ 4,064
Service cost	0	0
Interest cost	157	172
Actuarial (gain) loss	(370)	682
Benefits paid	(282)	(344)
Projected benefit obligation at the end of the year	4,079	4,574	4,064
Change in plan assets
Fair value of plan assets at the beginning of the year	2,989	3,291
Actual return on plan assets	337	42
Employer contributions	71	0
Benefits paid	(282)	(344)
Fair value of plan assets at the end of the year	3,115	2,989	3,291
Funded status at end of year (underfunded) overfunded	(964)	(1,585)
Amounts recognized in consolidated balance sheets
Noncurrent liabilities	(964)	(1,585)
Amounts Recognized in Balance Sheet	(964)	(1,585)
Amounts recognized in balance sheet
Net loss	2,135	2,756
Total accumulated OCI (not adjusted for applicable tax)	$ 2,135	$ 2,756
Weighted average assumptions used to determine benefit obligations
Discount rate	3.80%	3.55%
Hourly Employees’ Plan
Change in projected benefit obligation
Benefit obligation at the beginning of the year	$ 4,329	$ 3,145
Service cost	124	389
Interest cost	152	137
Actuarial (gain) loss	(233)	687
Benefits paid	(43)	(29)
Projected benefit obligation at the end of the year	4,329	4,329	3,145
Change in plan assets
Fair value of plan assets at the beginning of the year	2,447	2,104
Actual return on plan assets	256	85
Employer contributions	339	287
Benefits paid	(43)	(29)
Fair value of plan assets at the end of the year	2,999	2,447	$ 2,104
Funded status at end of year (underfunded) overfunded	(1,330)	(1,882)
Amounts recognized in consolidated balance sheets
Noncurrent liabilities	(1,330)	(1,882)
Amounts Recognized in Balance Sheet	(1,330)	(1,882)
Amounts recognized in balance sheet
Net loss	618	988
Total accumulated OCI (not adjusted for applicable tax)	$ 618	$ 988
Weighted average assumptions used to determine benefit obligations
Discount rate	3.80%	3.55%