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Share-Based Compensation - Stock Option Activity (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Proceeds from stock option exercises |  |  | $ 625,000 | $ 405,000 |  |
NQOs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  | 12,000 |  |  |
Proceeds from stock option exercises |  |  | $ 500,000 | 400,000 |  |
NQOs | Vested |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Number of options - Beginning balance (in shares) |  |  | 133,464 |  |  |
Number of options - Ending balance (in shares) |  |  |  |  | 133,464 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Weighted Average Exercise Price, Beginning balance (in US$ per share) |  |  | $ 13.05 |  |  |
Weighted Average Exercise Price, Ending balance (in US$ per share) |  |  |  |  | $ 13.05 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |  |
Weighted Average Grant Date Fair Value, Beginning balance (in US$ per share) |  |  | 5.99 |  |  |
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) |  |  |  |  | $ 5.99 |
Weighted Average Remaining Life, Beginning balance |  |  |  |  | 2 years 7 months 6 days |
Weighted Average Remaining Life, Ending balance |  |  |  |  | 2 years 7 months 6 days |
Aggregate Intrinsic Value, Beginning balance |  |  |  |  | $ 2,299,000 |
Aggregate Intrinsic Value, Ending balance |  |  |  |  | $ 2,299,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] |  |  |  |  |  |
Options, Vested and exercisable, Outstanding (in shares) |  |  |  |  |  | 89,055
Options, Vested and exercisable, Weighted Average Exercise Price (in US$ per share) |  |  |  |  |  | $ 12.33
Options, Vested and exercisable, Weighted Average Grant Date Fair Value (in US$ per share) |  |  | $ 5.74 |  |  |
Options, Vested and exercisable, Weighted Average Remaining Contractual Term |  |  | 2 years |  |  |
Options, Vested and exercisable, Aggregate Intrinsic Value |  |  |  |  |  | $ 1,765,000
Options, Vested and expected to vest, Outstanding (in shares) |  |  |  |  |  | 205,308
Options, Vested and expected to vest, Weighted Average Exercise Price (in US$ per share) |  |  |  |  |  | $ 23.28
Options, Vested and expected to vest, Weighted Average Grant Date Fair Value (in US$ per share) |  |  | $ 8.41 |  |  |
Options, Vested and expected to vest, Exercisable, Weighted Average Remaining Life |  |  | 4 years 8 months 12 days |  |  |
Options, Vested and expected to vest, Aggregate Intrinsic Value |  |  |  |  |  | $ 1,820,000
NQOs | 2017 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Number of options granted (shares) |  |  | 124,278 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Weighted average purchase price (in US$ per share) |  |  | $ 31.70 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |  |
Weighted average fair value (in US$ per share) |  |  | $ 10.41 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Remaining Contractual Term |  |  | 6 years 10 months 24 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value |  |  | $ 0 |  |  |
NQOs | Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares |  |  | (945) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Number of options exercised (shares) |  |  | (37,266) |  |  |
Number of options cancelled/forfeited (shares) |  |  | (4,194) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Weighted Average Exercise Price, Exercised (in US$ per share) |  |  | $ 12.09 |  |  |
Weighted Average Exercise Price, Cancelled/Forfeited (in US$ per share) |  |  | 24.41 |  |  |
Weighted Average Exercise Price, Ending balance (in US$ per share) | $ 23.71 |  | 23.71 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |  |
Weighted average fair value (in US$ per share) |  |  | 31.70 |  |  |
Weighted Average Grant Date Fair Value, Exercised (in US$ per share) |  |  | 5.57 |  |  |
Weighted Average Grant Date Fair Value, Cancelled/Forfeited (in US$ per share) |  |  | 10.60 |  |  |
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) | $ 8.51 |  | $ 8.51 |  |  |
Weighted Average Remaining Life, Beginning balance |  |  | 4 years 9 months 18 days |  |  |
Weighted Average Remaining Life, Ending balance |  |  | 4 years 9 months 18 days |  |  |
Aggregate Intrinsic Value, Beginning balance | $ 1,825,000 |  | $ 1,825,000 |  |  | $ 1,825,000
Aggregate intrinsic value, exercised |  |  | 752,000 |  |  |
Aggregate Intrinsic Value, Cancelled/Forfeited |  |  | 0 |  |  |
Aggregate Intrinsic Value, Ending balance | 1,825,000 |  | 1,825,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options |  |  |  |  |  | 216,282
PNQs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  | 600,000 |  |  |
Proceeds from stock option exercises |  |  | $ 200,000 | 100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |  |
Weighted Average Remaining Life, Beginning balance |  |  | 4 years 6 months 22 days |  |  |
Weighted Average Remaining Life, Ending balance |  |  | 4 years 6 months 22 days |  |  |
PNQs | Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense recognized | $ 200,000 | $ 400,000 | $ 400,000 | 600,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares |  |  | (56,822) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Number of options - Beginning balance (in shares) |  |  | 358,786 |  |  |
Number of options granted (shares) |  |  | 0 |  |  |
Number of options exercised (shares) |  |  | (6,679) |  |  |
Number of options cancelled/forfeited (shares) |  |  | (43,330) |  |  |
Number of options - Ending balance (in shares) | 308,777 |  | 308,777 |  | 358,786 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Weighted Average Exercise Price, Beginning balance (in US$ per share) |  |  | $ 27.75 |  |  |
Weighted average purchase price (in US$ per share) |  |  | 0.00 |  |  |
Weighted Average Exercise Price, Exercised (in US$ per share) |  |  | 26.10 |  |  |
Weighted Average Exercise Price, Cancelled/Forfeited (in US$ per share) |  |  | 32.10 |  |  |
Weighted Average Exercise Price, Ending balance (in US$ per share) | $ 27.17 |  | 27.17 |  | $ 27.75 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |  |
Weighted Average Grant Date Fair Value, Beginning balance (in US$ per share) |  |  | 10.96 |  |  |
Weighted average fair value (in US$ per share) |  |  | 0.00 |  |  |
Weighted Average Grant Date Fair Value, Exercised (in US$ per share) |  |  | 10.87 |  |  |
Weighted Average Grant Date Fair Value, Cancelled/Forfeited (in US$ per share) |  |  | 11.43 |  |  |
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) | $ 10.90 |  | $ 10.90 |  | $ 10.96 |
Weighted Average Remaining Life, Beginning balance |  |  |  |  | 5 years 2 months 9 days |
Weighted Average Remaining Life, Ending balance |  |  |  |  | 5 years 2 months 9 days |
Aggregate Intrinsic Value, Beginning balance | $ 1,590,000 |  | $ 1,590,000 |  | $ 1,181,000 | $ 1,590,000
Aggregate intrinsic value, exercised |  |  | 45,000 |  |  |
Aggregate Intrinsic Value, Cancelled/Forfeited |  |  | 0 |  |  |
Aggregate Intrinsic Value, Ending balance | 1,590,000 |  | $ 1,590,000 |  | $ 1,181,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] |  |  |  |  |  |
Options, Vested and exercisable, Outstanding (in shares) |  |  |  |  |  | 200,904
Options, Vested and exercisable, Weighted Average Exercise Price (in US$ per share) |  |  |  |  |  | $ 25.87
Options, Vested and exercisable, Weighted Average Grant Date Fair Value (in US$ per share) |  |  | $ 10.80 |  |  |
Options, Vested and exercisable, Weighted Average Remaining Contractual Term |  |  | 4 years 2 months 23 days |  |  |
Options, Vested and exercisable, Aggregate Intrinsic Value |  |  |  |  |  | $ 1,278,000
Options, Vested and expected to vest, Outstanding (in shares) |  |  |  |  |  | 303,990
Options, Vested and expected to vest, Weighted Average Exercise Price (in US$ per share) |  |  |  |  |  | $ 27.10
Options, Vested and expected to vest, Weighted Average Grant Date Fair Value (in US$ per share) |  |  | $ 10.89 |  |  |
Options, Vested and expected to vest, Exercisable, Weighted Average Remaining Life |  |  | 4 years 6 months 15 days |  |  |
Options, Vested and expected to vest, Aggregate Intrinsic Value |  |  |  |  |  | $ 1,585,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value |  |  | $ 0 |  |  |
General and Administrative Expense | Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense recognized | $ 62,000 | $ 0 | $ 64,000 | $ 89,000 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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