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

Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan

No definition available.

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