Employee Benefit Plans - Description of Investment Policy (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Farmer Brothers Plan
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 146,291	$ 152,325	$ 136,962
Accumulated benefit obligation	146,291	152,325
Fair value of plan assets at measurement date	$ 97,304	$ 91,201	94,815
Plan assets by category	0.00%	0.00%
Farmer Brothers Plan \| Equity Securities
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 65,270	$ 58,094
Plan assets by category	67.00%	64.00%
Farmer Brothers Plan \| Debt securities
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 26,241	$ 27,586
Plan assets by category	27.00%	30.00%
Farmer Brothers Plan \| Real estate
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 5,793	$ 5,521
Plan assets by category	6.00%	6.00%
Brewmatic Plan
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 4,079	$ 4,574	4,064
Accumulated benefit obligation	4,079	4,574
Fair value of plan assets at measurement date	$ 3,115	$ 2,989	3,291
Plan assets by category	100.00%	100.00%
Brewmatic Plan \| Equity Securities
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 2,133	$ 1,909
Plan assets by category	69.00%	64.00%
Brewmatic Plan \| Debt securities
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 793	$ 899
Plan assets by category	25.00%	30.00%
Brewmatic Plan \| Real estate
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 189	$ 181
Plan assets by category	6.00%	6.00%
Hourly Employees’ Plan
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 4,329	$ 4,329	3,145
Accumulated benefit obligation	4,329	4,329
Fair value of plan assets at measurement date	$ 2,999	$ 2,447	$ 2,104
Plan assets by category	100.00%	100.00%
Hourly Employees’ Plan \| Equity Securities
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 1,973	$ 1,542
Plan assets by category	66.00%	63.00%
Hourly Employees’ Plan \| Debt securities
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 851	$ 758
Plan assets by category	28.00%	31.00%
Hourly Employees’ Plan \| Real estate
Defined Benefit Plan Disclosure
Fair value of plan assets at measurement date	$ 175	$ 147
Plan assets by category	6.00%	6.00%

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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+ References

No definition available.

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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