Line of credit facility outstanding LIBOR loan amount.

No definition available.

Name:	mfi_LineOfCreditFacilityOutstandingLiborLoanAmount
Namespace Prefix:	mfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of credit facility outstanding prime rate loan amount.

+ References

No definition available.

+ Details

Name:	mfi_LineOfCreditFacilityOutstandingPrimeRateLoanAmount
Namespace Prefix:	mfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	mfi_RevolvingLineOfCreditAdditionalTextualAbstract
Namespace Prefix:	mfi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	mfi_RevolvingLineOfCreditTextualAbstract
Namespace Prefix:	mfi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Term loan period for converted unpaid balance.

+ References

No definition available.

+ Details

Name:	mfi_TermLoanPeriodForConvertedUnpaidBalance
Namespace Prefix:	mfi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

The effective interest rate at the end of the reporting period.

+ 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDescription
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

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

Revolving Line of Credit (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	10 Months Ended
	Jun. 30, 2010	Oct. 31, 2011	Jun. 30, 2012	Jul. 31, 2010	Feb. 28, 2009	Jul. 31, 2008	Aug. 02, 2007
Revolving Line of Credit (Textual) [Abstract]
Interest rate on line of credit borrowings	Prime plus 1.75% or at a London Interbank Offered Rate (“LIBOR”) plus 3.75%	Prime plus 0.75% or LIBOR plus 2.75%
Revolving Line of Credit (Additional Textual) [Abstract]
Borrowing capacity under revolving line of credit				$ 100	$ 85	$ 60	$ 30
Line of credit facility outstanding LIBOR loan amount			57.0
Line of credit facility outstanding Prime Rate Loan amount			11.5
Available on revolving line of credit			$ 31.5
Term loan period for converted unpaid balance			6 months
Prime [Member]
Revolving Line of Credit (Textual) [Abstract]
Spread on interest Rate on line of credit borrowings		0.75%		1.25%
LIBOR [Member]
Revolving Line of Credit (Textual) [Abstract]
Spread on interest Rate on line of credit borrowings		2.75%		3.25%
Maximum [Member]
Revolving Line of Credit (Textual) [Abstract]
Interest rate on loans			3.10%
Minimum [Member]
Revolving Line of Credit (Textual) [Abstract]
Interest rate on loans			4.00%