Investments and Derivative Instruments - Gross Unrealized Losses (Details) (Preferred Stock, USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Preferred Stock
Schedule of Trading Securities and Other Trading Assets
Less than 12 Months, Fair Value	$ 1,750	$ 319
Less than 12 Months, Unrealized Loss	(16)	(3)
Fair Value	2,891	6,326
Unrealized Loss	$ (40)	$ (1,122)

Trading Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses

No definition available.

Name:	farm_TradingSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
Namespace Prefix:	farm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant