Employee Stock Ownership Plan - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Initial term of employer loan	15 years
Related party transaction, Interest rate	1.69%
Dividends on ESOP shares used to pay down loan			$ 1.3
Shares issued to compensate for shortfall		1,040
Compensation Expense	2.1	1.5	2.6
Difference between cost and market value of committed to be released shares	$ 0.1	$ 0.1	$ (1.4)

Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Dividends Used for Debt Service

No definition available.

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Period Type:	duration

- Definition

Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Interest Rate During Period

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	farm_
Data Type:	xbrli:durationItemType
Balance Type:	na
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- Details

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- Definition

The amount of plan compensation cost recognized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 93-6

-Paragraph 53

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The difference between cost and fair value added or subtracted from paid-in capital, arising from contribution of shares to an ESOP or commitments-to-release ESOP shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 30

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6418548&loc=d3e17042-113922

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 93-6

-Paragraph 53

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration