Defined Contribution Plan, Employer Matching Contribution, Amount

No definition available.

Name:	farm_DefinedContributionPlanEmployerMatchingContributionAmount
Namespace Prefix:	farm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Multiemployer Plan, Number of Plans

+ References

No definition available.

+ Details

Name:	farm_MultiemployerPlanNumberofPlans
Namespace Prefix:	farm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Multiemployer Plans, Collective-Bargaining Arrangement, Hours of Contributions

+ References

No definition available.

+ Details

Name:	farm_MultiemployerPlansCollectiveBargainingArrangementHoursOfContributions
Namespace Prefix:	farm_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Multiemployer Plans, Estimated Employer Contributions in Next Fiscal Year

+ References

No definition available.

+ Details

Name:	farm_MultiemployerPlansEstimatedEmployerContributionsinNextFiscalYear
Namespace Prefix:	farm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Multiemployer Plans, Withdrawal Obligation, Monthly Payment Election, Periodic Payment Amount

+ References

No definition available.

+ Details

Name:	farm_MultiemployerPlansWithdrawalObligationMonthlyPaymentElectionPeriodicPaymentAmount
Namespace Prefix:	farm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Multiemployer Plans, Withdrawal Obligation, Monthly Payment Election, Periodic Payment Period

+ References

No definition available.

+ Details

Name:	farm_MultiemployerPlansWithdrawalObligationMonthlyPaymentElectionPeriodicPaymentPeriod
Namespace Prefix:	farm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of contributions required of employer under collective bargaining arrangement to total contributions required under all collective bargaining arrangements for pension and other postretirement plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

+ Details

Name:	us-gaap_MultiemployerPlanCollectiveBargainingArrangementPercentageOfContributionsRequiredForMultipleCollectiveBargainingArrangements
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of contributions made to multiemployer plan by employer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

+ Details

Name:	us-gaap_MultiemployerPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_MultiemployerPlansLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

+ Details

Name:	us-gaap_MultiemployerPlansWithdrawalObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_MultiemployerPlanNameAxis=farm_WesternConferenceOfTeamstersPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MultiemployerPlanNameAxis=farm_LaborManagementPensionFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MultiemployerPlanNameAxis=farm_ProgramForEnhancedEarlyRetirementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MultiemployerPlanNameAxis=farm_AllOtherPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=farm_MultiemployerPlansDefinedBenefitPensionPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Employee Benefit Plans - Multi-Employer Plan (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2019 USD ($) plan	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 quarter	Jan. 05, 2015 USD ($)	Nov. 18, 2014 USD ($)	Jun. 30, 2012 USD ($)
Multiemployer Plans [Line Items]
Defined contribution plan, employer matching contribution	$ 1,600	$ 2,200	$ 2,000
Employer contributions		3,325	3,804
Multiemployer plan, period contribution	5,300	5,200	4,800
Multiemployer plan, estimated contribution in next fiscal year		5,800
Western Conference of Teamsters Pension Plan
Multiemployer Plans [Line Items]
Employer contributions		3,634	$ 1,605	$ 2,114
Employer contributions (percentage)			5.00%
Labor Management Pension Fund
Multiemployer Plans [Line Items]
Withdrawal obligation						$ 4,900	$ 4,400	$ 4,300
Multiemployer plan, quarterly installments for withdrawal liability	$ 100
Multiemployer plan, quarterly installments for withdrawal liability, number of quarters \| quarter					80
Program for Enhanced Early Retirement
Multiemployer Plans [Line Items]
Employer contributions (percentage)			6.50%
Employer contributions (hours)			173
All Other Plans
Multiemployer Plans [Line Items]
Employer contributions		$ 39	$ 35	39
Other Postretirement Benefits Plan
Multiemployer Plans [Line Items]
Multiemployer plans, number of plans \| plan		9
Employer contributions			$ 618	$ 771
Multiemployer Plans, Defined Benefit Pension Plans [Member]
Multiemployer Plans [Line Items]
Multiemployer plans, number of plans \| plan		2