Investments and Derivative Instruments - Gross Unrealized Losses (Details) (Preferred Stock, USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
Preferred Stock
Schedule of Trading Securities and Other Trading Assets
Less than 12 Months, Fair Value	$ 445	$ 1,750
Less than 12 Months, Unrealized Loss	(3)	(16)
Fair Value	1,806	2,891
Unrealized Loss	$ (46)	$ (40)

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