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Employee Benefit Plans - Change in Projected Benefit Obligation, Plan Assets and Net Funded Status (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Amounts recognized in consolidated balance sheets |  |  |
Current liabilities | $ (3,761) | $ (3,956) |
Weighted average assumptions used to determine benefit obligations |  |  |
Discount rate | 4.30% |  |
Other Postretirement Benefits Plan |  |  |
Change in projected benefit obligation |  |  |
Benefit obligation at the beginning of the year | $ 20,680 | 21,867 |
Service cost | 609 | 760 | $ 1,388
Interest cost | 835 | 829 | 1,194
Participant contributions | 699 | 741 |
Actuarial (gain) loss | (70) | (2,377) |
Benefits paid | (1,470) | (1,140) |
Projected benefit obligation at the end of the year | 21,283 | 20,680 | 21,867
Change in plan assets |  |  |
Fair value of plan assets at the beginning of the year | 0 | 0 |
Employer contributions | 771 | 399 |
Participant contributions | 699 | 741 |
Benefits paid | (1,470) | (1,140) |
Fair value of plan assets at the end of the year | 0 | 0 | 0
Funded status at end of year (underfunded) overfunded | (21,283) | (20,680) |
Amounts recognized in consolidated balance sheets |  |  |
Current liabilities | (810) | (893) |
Noncurrent liabilities | (20,473) | (19,787) |
Amounts Recognized in Balance Sheet | (21,283) | (20,680) |
Farmer Brothers Plan |  |  |
Change in projected benefit obligation |  |  |
Benefit obligation at the beginning of the year | 146,291 | 152,325 |
Service cost | 0 | 0 |
Interest cost | 5,417 | 5,277 |
Actuarial (gain) loss | (5,956) | (4,556) |
Benefits paid | (8,577) | (6,755) |
Projected benefit obligation at the end of the year | 137,175 | 146,291 | 152,325
Change in plan assets |  |  |
Fair value of plan assets at the beginning of the year | 97,304 | 91,201 |
Actual return on plan assets | 5,874 | 10,874 |
Employer contributions | 2,610 | 1,984 |
Benefits paid | (8,577) | (6,755) |
Fair value of plan assets at the end of the year | 97,211 | 97,304 | 91,201
Funded status at end of year (underfunded) overfunded | (39,964) | (48,987) |
Amounts recognized in consolidated balance sheets |  |  |
Noncurrent liabilities | (39,964) | (48,987) |
Amounts Recognized in Balance Sheet | (39,964) | (48,987) |
Amounts recognized in balance sheet |  |  |
Net loss | 51,079 | 59,007 |
Total accumulated OCI (not adjusted for applicable tax) | $ 51,079 | $ 59,007 |
Weighted average assumptions used to determine benefit obligations |  |  |
Discount rate | 4.05% | 3.80% |
Brewmatic Plan |  |  |
Change in projected benefit obligation |  |  |
Benefit obligation at the beginning of the year | $ 4,079 | $ 4,574 |
Service cost | 0 | 0 |
Interest cost | 149 | 157 |
Actuarial (gain) loss | (227) | (370) |
Benefits paid | (277) | (282) |
Projected benefit obligation at the end of the year | 3,724 | 4,079 | 4,574
Change in plan assets |  |  |
Fair value of plan assets at the beginning of the year | 3,115 | 2,989 |
Actual return on plan assets | 201 | 337 |
Employer contributions | 680 | 71 |
Benefits paid | (277) | (282) |
Fair value of plan assets at the end of the year | 3,719 | 3,115 | 2,989
Funded status at end of year (underfunded) overfunded | (5) | (964) |
Amounts recognized in consolidated balance sheets |  |  |
Noncurrent liabilities | (5) | (964) |
Amounts Recognized in Balance Sheet | (5) | (964) |
Amounts recognized in balance sheet |  |  |
Net loss | 1,788 | 2,135 |
Total accumulated OCI (not adjusted for applicable tax) | $ 1,788 | $ 2,135 |
Weighted average assumptions used to determine benefit obligations |  |  |
Discount rate | 4.05% | 3.80% |
Hourly Employees’ Plan |  |  |
Change in projected benefit obligation |  |  |
Benefit obligation at the beginning of the year | $ 4,329 | $ 4,329 |
Service cost | 0 | 124 |
Interest cost | 163 | 152 |
Actuarial (gain) loss | (370) | (233) |
Benefits paid | (82) | (43) |
Projected benefit obligation at the end of the year | 4,040 | 4,329 | 4,329
Change in plan assets |  |  |
Fair value of plan assets at the beginning of the year | 2,999 | 2,447 |
Actual return on plan assets | 198 | 256 |
Employer contributions | 514 | 339 |
Benefits paid | (82) | (43) |
Fair value of plan assets at the end of the year | 3,629 | 2,999 | $ 2,447
Funded status at end of year (underfunded) overfunded | (411) | (1,330) |
Amounts recognized in consolidated balance sheets |  |  |
Noncurrent liabilities | (411) | (1,330) |
Amounts Recognized in Balance Sheet | (411) | (1,330) |
Amounts recognized in balance sheet |  |  |
Net loss | 218 | 618 |
Total accumulated OCI (not adjusted for applicable tax) | $ 218 | $ 618 |
Weighted average assumptions used to determine benefit obligations |  |  |
Discount rate | 4.05% | 3.80% |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of 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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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