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Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options granted (shares) |  |  | 22,862 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |
Weighted average fair value (in US$ per share) | $ 10.41 | $ 12.63 |  |  |
Non-qualified Stock Options with Time-based Vesting (NQO) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options exercised (shares) | (86,160) | (67,482) | (112,895) |  |
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) | $ 12.32 | $ 12.38 | $ 12.35 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |
Weighted Average Grant Date Fair Value, Exercised (in US$ per share) | $ 5.71 | $ 5.57 | $ 5.37 |  |
Weighted Average Remaining Life, Beginning balance | 5 years 1 month 6 days | 2 years 7 months 6 days | 3 years 8 months 12 days |  |
Weighted Average Remaining Life, Granted | 6 years 1 month 10 days |  | 6 years 4 months 24 days |  |
Weighted Average Remaining Life, Ending balance | 5 years 1 month 6 days | 2 years 7 months 6 days | 3 years 8 months 12 days |  |
Aggregate Intrinsic Value, Beginning balance | $ 741 | $ 2,299 | $ 3,995 |  | $ 741
Aggregate Intrinsic Value, Granted | 0 | 0 | 0 |  |
Aggregate intrinsic value, exercised | 1,654 | 1,407 | 1,853 |  |
Aggregate Intrinsic Value, Ending balance | $ 741 | $ 2,299 | $ 3,995 |  |
Non-qualified Stock Options with Time-based Vesting (NQO) [Member] | Nonvested |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options - Beginning balance (in shares) | 8,088 | 38,731 | 80,195 |  |
Number of options cancelled/forfeited (shares) | (10,258) | (14,878) | (15,641) |  |
Number of options - Ending balance (in shares) | 120,161 | 8,088 | 38,731 | 80,195 |
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) | $ 27.33 | $ 27.02 | $ 15.94 |  |
Weighted average purchase price (in US$ per share) |  |  | 29.48 |  |
Weighted Average Exercise Price, Cancelled/Forfeited (in US$ per share) | 30.47 | 27.44 | 12.95 |  |
Weighted Average Exercise Price, Ending balance (in US$ per share) | 31.70 | 27.33 | 27.02 | $ 15.94 |
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) | 11.47 | 11.63 | 7.21 |  |
Weighted average fair value (in US$ per share) |  |  | 12.63 |  |
Weighted Average Grant Date Fair Value, Cancelled/Forfeited (in US$ per share) | 12.40 | 11.96 | 6.09 |  |
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) | $ 10.43 | $ 11.47 | $ 11.63 | $ 7.21 |
Weighted Average Remaining Life, Beginning balance | 6 years 4 months 10 days | 5 years 3 months | 6 years 1 month 6 days | 5 years 2 months 12 days |
Weighted Average Remaining Life, Ending balance | 6 years 4 months 10 days | 5 years 3 months | 6 years 1 month 6 days | 5 years 2 months 12 days |
Non-qualified Stock Options with Time-based Vesting (NQO) [Member] | Vested |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options - Beginning balance (in shares) | 133,464 | 219,629 | 329,300 |  |
Number of options granted (shares) | 124,278 | 0 | 21,595 |  |
Number of options vested (shares) | (1,947) | (15,765) | (47,418) |  |
Number of options cancelled/forfeited (shares) | (10,258) | (18,683) | (18,371) |  |
Number of options - Ending balance (in shares) | 161,324 | 133,464 | 219,629 | 329,300 |
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 | $ 13.87 | $ 12.30 |  |
Weighted average purchase price (in US$ per share) | 31.70 | 0.00 | 29.48 |  |
Weighted Average Exercise Price, Vested (in US$ per share) | 31.70 | 26.45 | 14.05 |  |
Weighted Average Exercise Price, Cancelled/Forfeited (in US$ per share) | 28.52 | 25.13 | 13.45 |  |
Weighted Average Exercise Price, Ending balance (in US$ per share) | 26.82 | 13.05 | 13.87 | $ 12.30 |
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 | 6.28 | 5.54 |  |
Weighted average fair value (in US$ per share) | 10.41 | 0.00 | 12.63 |  |
Weighted Average Grant Date Fair Value, Vested (in US$ per share) | 10.41 | 11.41 | 6.44 |  |
Weighted Average Grant Date Fair Value, Cancelled/Forfeited (in US$ per share) | 10.72 | 10.90 | 6.17 |  |
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) | 9.24 | $ 5.99 | $ 6.28 | $ 5.54 |
Weighted Average Remaining Life, Beginning balance |  |  |  | 3 years 10 months 24 days |
Weighted Average Remaining Life, Ending balance |  |  |  | 3 years 10 months 24 days |
Aggregate Intrinsic Value, Beginning balance |  |  |  | $ 3,700 |
Aggregate Intrinsic Value, Ending balance |  |  |  | $ 3,700 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] |  |  |  |  |
Options, Vested and exercisable, Outstanding (in shares) |  |  |  |  | 41,163
Options, Vested and exercisable, Weighted Average Exercise Price (in US$ per share) |  |  |  |  | $ 12.59
Options, Vested and exercisable, Weighted Average Grant Date Fair Value (in US$ per share) | $ 5.79 |  |  |  |
Options, Vested and exercisable, Weighted Average Remaining Contractual Term | 1 year 6 months |  |  |  |
Options, Vested and exercisable, Aggregate Intrinsic Value |  |  |  |  | $ 741
Options, Vested and expected to vest, Outstanding (in shares) |  |  |  |  | 153,562
Options, Vested and expected to vest, Weighted Average Exercise Price (in US$ per share) |  |  |  |  | $ 26.58
Options, Vested and expected to vest, Weighted Average Grant Date Fair Value (in US$ per share) | $ 9.18 |  |  |  |
Options, Vested and expected to vest, Exercisable, Weighted Average Remaining Life | 5 years 1 month 6 days |  |  |  |
Options, Vested and expected to vest, Aggregate Intrinsic Value |  |  |  |  | $ 741
Non-qualified Stock Options with Time-based Vesting (NQO) [Member] | Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options granted (shares) | 124,278 |  | 21,595 |  |
PNQs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options exercised (shares) | (10,342) | (15,321) | (14,144) |  |
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) | $ 27.13 | $ 26.26 | $ 21.20 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |
Weighted Average Grant Date Fair Value, Exercised (in US$ per share) | $ 11.02 | $ 10.98 | $ 10.45 |  |
Aggregate intrinsic value, exercised | $ 61 | $ 109 | $ 107 |  |
PNQs | Vested |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options vested (shares) | (82,899) | (119,403) | (27,317) |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |
Weighted Average Exercise Price, Vested (in US$ per share) | $ 28.60 | $ 24.91 | $ 10.16 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |
Weighted Average Grant Date Fair Value, Vested (in US$ per share) | $ 10.99 | $ 10.75 | $ 23.44 |  |
PNQs | Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options - Beginning balance (in shares) | 358,786 | 288,599 | 224,067 |  |
Number of options granted (shares) |  | 149,223 | 143,466 |  |
Number of options cancelled/forfeited (shares) | (47,736) | (63,715) | (64,790) |  |
Number of options - Ending balance (in shares) | 300,708 | 358,786 | 288,599 | 224,067 |
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 | $ 25.83 | $ 22.44 |  |
Weighted average purchase price (in US$ per share) |  | 32.85 | 29.48 |  |
Weighted Average Exercise Price, Cancelled/Forfeited (in US$ per share) | 32.06 | 31.39 | 23.20 |  |
Weighted Average Exercise Price, Ending balance (in US$ per share) | 27.08 | 27.75 | 25.83 | $ 22.44 |
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 | 10.82 | 10.31 |  |
Weighted average fair value (in US$ per share) |  | 11.42 | 11.38 |  |
Weighted Average Grant Date Fair Value, Cancelled/Forfeited (in US$ per share) | 11.43 | 11.39 | 10.37 |  |
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) | $ 10.89 | $ 10.96 | $ 10.82 | $ 10.31 |
Weighted Average Remaining Life, Beginning balance | 4 years | 5 years 2 months 9 days | 5 years 8 months 12 days | 6 years |
Weighted Average Remaining Life, Granted |  | 4 years 7 months 21 days | 6 years 2 months 12 days |  |
Weighted Average Remaining Life, Ending balance | 4 years | 5 years 2 months 9 days | 5 years 8 months 12 days | 6 years |
Aggregate Intrinsic Value, Beginning balance | $ 1,207 | $ 1,181 | $ 1,798 | $ 237 | $ 1,207
Aggregate Intrinsic Value, Ending balance | $ 1,207 | $ 1,181 | $ 1,798 | $ 237 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] |  |  |  |  |
Options, Vested and exercisable, Outstanding (in shares) |  |  |  |  | 223,318
Options, Vested and exercisable, Weighted Average Exercise Price (in US$ per share) |  |  |  |  | $ 25.54
Options, Vested and exercisable, Weighted Average Grant Date Fair Value (in US$ per share) | $ 10.72 |  |  |  |
Options, Vested and exercisable, Weighted Average Remaining Contractual Term | 3 years 8 months 12 days |  |  |  |
Options, Vested and exercisable, Aggregate Intrinsic Value |  |  |  |  | $ 1,174
Options, Vested and expected to vest, Outstanding (in shares) |  |  |  |  | 298,120
Options, Vested and expected to vest, Weighted Average Exercise Price (in US$ per share) |  |  |  |  | $ 27.04
Options, Vested and expected to vest, Weighted Average Grant Date Fair Value (in US$ per share) | $ 10.88 |  |  |  |
Options, Vested and expected to vest, Exercisable, Weighted Average Remaining Life | 4 years |  |  |  |
Options, Vested and expected to vest, Aggregate Intrinsic Value |  |  |  |  | $ 1,206
PNQs | Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan | Nonvested |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options - Beginning balance (in shares) | 208,025 | 240,467 | 189,108 |  |
Number of options cancelled/forfeited (shares) | (47,736) | (62,262) |  |  |
Number of options - Ending balance (in shares) | 77,390 | 208,025 | 240,467 | 189,108 |
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) | $ 30.48 | $ 26.49 | $ 22.66 |  |
Weighted Average Exercise Price, Ending balance (in US$ per share) | 31.53 | 30.48 | 26.49 | $ 22.66 |
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) | 11.24 | 10.92 | 10.28 |  |
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) | $ 11.39 | $ 11.24 | $ 10.92 | $ 10.28 |
Weighted Average Remaining Life, Beginning balance | 5 years | 5 years 9 months 18 days | 5 years 10 months 24 days | 6 years 2 months 12 days |
Weighted Average Remaining Life, Granted |  | 4 years 7 months 6 days | 6 years 2 months 12 days |  |
Weighted Average Remaining Life, Ending balance | 5 years | 5 years 9 months 18 days | 5 years 10 months 24 days | 6 years 2 months 12 days |

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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 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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