Employee Stock Ownership Plan - ESOP Plan Contributions (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Share-based Payment Arrangement [Abstract]
Loan amount (in thousands)	$ 0	$ 2,145	$ 4,289

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