Line of Credit Facility, Revolving Loan Commitment, Accordion Feature

No definition available.

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

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Incremental percentage increase (decrease) in the stated rate on a debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentInterestRateIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFloorInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600

+ Details

Name:	us-gaap_LongTermLineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=farm_AmendedCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=farm_JPMorganandSunTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=farm_LoanAndSecurityAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=farm_JpMorganChaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=farm_SwingLineLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	farm_MutuallyExclusiveOptionAxis=farm_OptionOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	farm_MutuallyExclusiveOptionAxis=farm_OptionTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revolving Credit Facility (Details) - USD ($)			3 Months Ended	9 Months Ended	12 Months Ended
Revolving Credit Facility (Details) - USD ($)	Nov. 06, 2018	Aug. 25, 2017	Sep. 30, 2018	Mar. 31, 2019	Jun. 30, 2018	Oct. 18, 2018
Line of Credit Facility
Long-term borrowings under revolving credit facility				$ 123,000,000	$ 0
Revolving Credit Facility
Line of Credit Facility
Line of credit, current borrowing capacity				$ 150,000,000
Debt, weighted average interest rate				4.25%
Letter of Credit
Line of Credit Facility
Long-term borrowings under revolving credit facility				$ 2,000,000
Amended Credit Agreement [Member] \| Revolving Credit Facility
Line of Credit Facility
Line of credit, commitment fee percent		0.25%
JP Morgan and SunTrust \| Minimum
Line of Credit Facility
Debt Instrument, Interest Rate, Increase (Decrease)			0.375%
JP Morgan and SunTrust \| Maximum
Line of Credit Facility
Debt Instrument, Interest Rate, Increase (Decrease)			0.50%
JP Morgan and SunTrust \| Amended Credit Agreement [Member] \| Revolving Credit Facility
Line of Credit Facility
Line of credit, maximum borrowing capacity				125,000,000		$ 135,000,000
JP Morgan and SunTrust \| JPM Chase Loan Agreement \| Revolving Credit Facility
Line of Credit Facility
Line of Credit Facility, Revolving Loan Commitment, Accordion Feature				$ 10,000,000.0
JP Morgan Chase \| Amended Credit Agreement [Member] \| Revolving Credit Facility \| Minimum
Line of Credit Facility
Line of credit, commitment fee percent	0.20%
JP Morgan Chase \| Amended Credit Agreement [Member] \| Revolving Credit Facility \| Maximum
Line of Credit Facility
Line of credit, commitment fee percent	0.40%
JP Morgan Chase \| JPM Chase Loan Agreement \| Revolving Credit Facility
Line of Credit Facility
Line of credit, maximum borrowing capacity	$ 150,000,000
Line of Credit Facility, Revolving Loan Commitment, Accordion Feature	75,000,000
JP Morgan Chase \| JPM Chase Loan Agreement \| Swing Line Loans
Line of Credit Facility
Line of credit, maximum borrowing capacity	$ 15,000,000
Prime Rate \| JP Morgan and SunTrust
Line of Credit Facility
Line of credit, description of interest rate				PRIME + 0.25%
Prime Rate \| JP Morgan and SunTrust \| Minimum
Line of Credit Facility
Line of credit, description of interest rate					PRIME - 0.25%
Prime Rate \| JP Morgan and SunTrust \| Maximum
Line of Credit Facility
Line of credit, description of interest rate					PRIME + 0.50%
Prime Rate \| JP Morgan Chase \| Minimum
Line of Credit Facility
Line of credit, description of interest rate	PRIME + 0.25%
Prime Rate \| JP Morgan Chase \| Maximum
Line of Credit Facility
Line of credit, description of interest rate	PRIME + 0.875%
London Interbank Offered Rate (LIBOR) \| JP Morgan and SunTrust
Line of Credit Facility
Line of credit, description of interest rate				Adjusted LIBO Rate + 1.75%
London Interbank Offered Rate (LIBOR) \| JP Morgan and SunTrust \| Minimum
Line of Credit Facility
Line of credit, description of interest rate					Adjusted LIBO Rate + 1.25%
London Interbank Offered Rate (LIBOR) \| JP Morgan and SunTrust \| Maximum
Line of Credit Facility
Line of credit, description of interest rate					Adjusted LIBO Rate + 2.00%
London Interbank Offered Rate (LIBOR) \| JP Morgan Chase \| Minimum
Line of Credit Facility
Line of credit, description of interest rate	Adjusted LIBO Rate + 1.25%
London Interbank Offered Rate (LIBOR) \| JP Morgan Chase \| Maximum
Line of Credit Facility
Line of credit, description of interest rate	Adjusted LIBO Rate + 1.875%
Option One [Member] \| JP Morgan and SunTrust \| JPM Chase Loan Agreement \| Revolving Credit Facility
Line of Credit Facility
Debt Instrument, Description of Variable Rate Basis					Prime Rate
Option One [Member] \| JP Morgan and SunTrust \| JPM Chase Loan Agreement \| Revolving Credit Facility \| Minimum
Line of Credit Facility
Debt Instrument, Basis Spread on Variable Rate					(0.25%)
Option One [Member] \| JP Morgan and SunTrust \| JPM Chase Loan Agreement \| Revolving Credit Facility \| Maximum
Line of Credit Facility
Debt Instrument, Basis Spread on Variable Rate					0.50%
Option One [Member] \| JP Morgan Chase \| JPM Chase Loan Agreement \| Revolving Credit Facility
Line of Credit Facility
Debt Instrument, Description of Variable Rate Basis	Prime Rate
Option One [Member] \| JP Morgan Chase \| JPM Chase Loan Agreement \| Revolving Credit Facility \| Minimum
Line of Credit Facility
Debt Instrument, Basis Spread on Variable Rate	0.25%
Option One [Member] \| JP Morgan Chase \| JPM Chase Loan Agreement \| Revolving Credit Facility \| Maximum
Line of Credit Facility
Debt Instrument, Basis Spread on Variable Rate	0.875%
Option Two [Member] \| JP Morgan and SunTrust \| JPM Chase Loan Agreement \| Revolving Credit Facility
Line of Credit Facility
Debt Instrument, Description of Variable Rate Basis					LIBOR Rate
Option Two [Member] \| JP Morgan and SunTrust \| JPM Chase Loan Agreement \| Revolving Credit Facility \| Minimum
Line of Credit Facility
Debt Instrument, Basis Spread on Variable Rate					1.25%
Option Two [Member] \| JP Morgan and SunTrust \| JPM Chase Loan Agreement \| Revolving Credit Facility \| Maximum
Line of Credit Facility
Debt Instrument, Basis Spread on Variable Rate					2.00%
Option Two [Member] \| JP Morgan Chase \| JPM Chase Loan Agreement \| Revolving Credit Facility
Line of Credit Facility
Debt Instrument, Description of Variable Rate Basis	LIBOR Rate
Option Two [Member] \| JP Morgan Chase \| JPM Chase Loan Agreement \| Revolving Credit Facility \| Minimum
Line of Credit Facility
Debt Instrument, Basis Spread on Variable Rate	1.25%
Option Two [Member] \| JP Morgan Chase \| JPM Chase Loan Agreement \| Revolving Credit Facility \| Maximum
Line of Credit Facility
Debt Instrument, Basis Spread on Variable Rate	1.875%
Interest Rate Swap [Member]
Line of Credit Facility
Derivative, Notional Amount				$ 80,000,000
Derivative, Floor Interest Rate				0.00%
Derivative, Fixed Interest Rate				2.1975%