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Employee Stock Ownership Plan - ESOP Plan Contributions (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jun. 30, 2018
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Loan amount (in thousands) | $ 0 | $ 2,145

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- Definition Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan + References No definition available. + Details
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Namespace Prefix: | farm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration