Employee Benefit Plans - Change in Projected Benefit Obligation, Plan Assets and Net Funded Status (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Amounts recognized in balance sheet
Current liabilities			$ 347	$ 347
Weighted average assumptions used to determine benefit obligations
Discount rate			3.70%
Farmer Brothers Plan
Change in projected benefit
Benefit obligation at the beginning of the year	$ 136,962	$ 133,136	$ 136,962	133,136
Service cost			0	0
Interest cost			5,875	5,393
Actuarial loss			15,999	4,596
Benefits paid			(6,511)	(6,163)
Benefit obligation at the end of the year			152,325	136,962	$ 133,136
Change in plan assets
Fair value of plan assets at the beginning of the year	94,815	98,426	94,815	98,426
Actual return on plan assets			1,556	1,731
Employer contributions			1,341	821
Benefits paid			(6,511)	(6,163)
Fair value of plan assets at the ending of the year			91,201	94,815	98,426
Funded status at end of year (underfunded)/overfunded			(61,124)	(42,147)
Amounts recognized in balance sheet
Noncurrent liabilities			(61,124)	(42,147)
Amounts Recognized in Balance Sheet			(61,124)	(42,147)
Amounts recognized in balance sheet
Total net (gain) loss			70,246	50,743
Total accumulated OCI (not adjusted for applicable tax)			$ 70,246	$ 50,743
Weighted average assumptions used to determine benefit obligations
Discount rate			3.55%	4.40%
Brewmatic Plan
Change in projected benefit
Benefit obligation at the beginning of the year	4,064	3,991	$ 4,064	$ 3,991
Service cost			0	0
Interest cost			172	160
Actuarial loss			682	188
Benefits paid			(344)	(275)
Benefit obligation at the end of the year			4,574	4,064	3,991
Change in plan assets
Fair value of plan assets at the beginning of the year	3,291	3,435	3,291	3,435
Actual return on plan assets			42	66
Employer contributions			0	65
Benefits paid			(344)	(275)
Fair value of plan assets at the ending of the year			2,989	3,291	3,435
Funded status at end of year (underfunded)/overfunded			(1,585)	(773)
Amounts recognized in balance sheet
Noncurrent liabilities			(1,585)	(773)
Amounts Recognized in Balance Sheet			(1,585)	(773)
Amounts recognized in balance sheet
Total net (gain) loss			2,756	1,965
Total accumulated OCI (not adjusted for applicable tax)			$ 2,756	$ 1,965
Weighted average assumptions used to determine benefit obligations
Discount rate			3.55%	4.40%
Hourly Employees’ Plan
Change in projected benefit
Benefit obligation at the beginning of the year	3,145	2,619	$ 3,145	$ 2,619
Service cost			389	386
Interest cost			137	108
Actuarial loss			687	56
Benefits paid			(29)	(24)
Benefit obligation at the end of the year			4,329	3,145	2,619
Change in plan assets
Fair value of plan assets at the beginning of the year	2,104	1,629	2,104	1,629
Actual return on plan assets			85	10
Employer contributions			287	489
Benefits paid			(29)	(24)
Fair value of plan assets at the ending of the year			2,447	2,104	1,629
Funded status at end of year (underfunded)/overfunded			(1,882)	(1,041)
Amounts recognized in balance sheet
Noncurrent liabilities			(1,882)	(1,041)
Amounts Recognized in Balance Sheet			(1,882)	(1,041)
Amounts recognized in balance sheet
Total net (gain) loss			988	237
Total accumulated OCI (not adjusted for applicable tax)			$ 988	$ 237
Weighted average assumptions used to determine benefit obligations
Discount rate			3.55%	4.40%
Postretirement Benefits Other Than Pension
Change in projected benefit
Benefit obligation at the beginning of the year	24,522	20,889	$ 24,522	$ 20,889
Service cost	1,388	1,195	1,388	1,195	936
Interest cost	1,194	943	1,194	943	810
Participant contributions	795	711	795	711
Actuarial loss	(4,259)	2,751	(4,259)	2,751
Benefits paid	(1,773)	(1,967)	(1,773)	(1,967)
Benefit obligation at the end of the year			21,867	24,522	20,889
Change in plan assets
Fair value of plan assets at the beginning of the year	0	0	0	0
Employer contributions			978	1,256
Participant contributions	795	711	795	711
Benefits paid	$ (1,773)	$ (1,967)	(1,773)	(1,967)
Fair value of plan assets at the ending of the year			0	0	$ 0
Funded status at end of year (underfunded)/overfunded			(21,867)	(24,522)
Amounts recognized in balance sheet
Non-current assets			0	0
Current liabilities			1,060	1,051
Noncurrent liabilities			(20,807)	(23,471)
Amounts Recognized in Balance Sheet			$ (21,867)	$ (24,522)