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Employee Benefit Plans - Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2012 quarter
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Percentage of employee contribution eligible for Company matching | 50.00%farm_DefinedContributionPlanEmployerMatchingContributionPercentageOfEmployeeContribution |  |
Company contribution, maximum percentage of employee's eligible income | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Plan periodic vesting percentage | 20.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage |  |
Plan, periodic vesting period | 5 years |  |
Automatic vesting age | 65 years |  |
Current employees, percent vested | 100.00%farm_DefinedContributionPlanEmployeeContributionPercentageVestedPercent |  |
Employer match contribution amount | $ 0.7 farm_DefinedContributionPlanEmployerMatchingContributionAmount | $ 0.5 farm_DefinedContributionPlanEmployerMatchingContributionAmount |
Other Postretirement Benefit Plans, Defined Contribution [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Number of non-pension multiemployer plans that the Company participates in | 7 farm_MultiemployerPlansNumberOfPlans / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = farm_OtherPostretirementBenefitPlansDefinedContributionMember |  |
Labor Management Pension Fund [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Withdrawal obligation |  |  | 4.3 us-gaap_MultiemployerPlansWithdrawalObligation / us-gaap_MultiemployerPlanNameAxis = farm_LaborManagementPensionFundMember
Quarterly installment payments on estimated withdrawal liability |  |  | $ 0.1 farm_MultiemployerPlansWithdrawalObligationMonthlyPaymentElectionPeriodicPaymentAmount / us-gaap_MultiemployerPlanNameAxis = farm_LaborManagementPensionFundMember
Number of quarters relating to installment payments on estimated withdrawal liability |  |  | 80 farm_MultiemployerPlansWithdrawalObligationMonthlyPaymentElectionPeriodicPaymentPeriod / us-gaap_MultiemployerPlanNameAxis = farm_LaborManagementPensionFundMember
Pension Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Number of non-pension multiemployer plans that the Company participates in | 2 farm_MultiemployerPlansNumberOfPlans / us-gaap_MultiemployerPlanTypeAxis = us-gaap_PensionPlansDefinedBenefitMember |  |

X
- Definition Defined Contribution Plan, Automatic Vesting Age + References No definition available. + Details
Name: | farm_DefinedContributionPlanAutomaticVestingAge
Namespace Prefix: | farm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Employee Contribution Percentage Vested, Percent + References No definition available. + Details
Name: | farm_DefinedContributionPlanEmployeeContributionPercentageVestedPercent
Namespace Prefix: | farm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Employer Matching Contribution, Amount + References No definition available. + Details
Name: | farm_DefinedContributionPlanEmployerMatchingContributionAmount
Namespace Prefix: | farm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined Contribution Plan, Employer Matching Contribution, Percentage of Employee Contribution + References No definition available. + Details
Name: | farm_DefinedContributionPlanEmployerMatchingContributionPercentageOfEmployeeContribution
Namespace Prefix: | farm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Vesting Period + References No definition available. + Details
Name: | farm_DefinedContributionPlanVestingPeriod
Namespace Prefix: | farm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Multiemployer Plans, Number of Plans + References No definition available. + Details
Name: | farm_MultiemployerPlansNumberOfPlans
Namespace Prefix: | farm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- 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

X
- Details
Name: | us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis=farm_OtherPostretirementBenefitPlansDefinedContributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_MultiemployerPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |