Name:	mfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationInPeriodWeightedAverageExercisePrice
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Share based compensation arrangement by share based payment award options forfeited in period weighted average exercise price.

No definition available.

Name:	mfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodWeightedAverageExercisePrice
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Share based compensation arrangement by share based payment award options grant in period weighted average exercise price.

No definition available.

Name:	mfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantInPeriodWeightedAverageExercisePrice
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Share based compensation shares authorized under stock option plans expired price range lower range limit.

No definition available.

Name:	mfi_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExpiredPriceRangeLowerRangeLimit
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Share based compensation shares authorized under stock option plans forfeited price range lower range limit.

No definition available.

Name:	mfi_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansForfeitedPriceRangeLowerRangeLimit
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Share based compensation shares authorized under stock option plans granted price range lower range limit.

No definition available.

Name:	mfi_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantedPriceRangeLowerRangeLimit
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Share based compensation shares authorized under stock option plans outstanding price range lower range limit.

No definition available.

Name:	mfi_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansOutstandingPriceRangeLowerRangeLimit
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Share based compensation shares authorized under stock option plans outstanding price range lower range limit as of the beginning of the period.

No definition available.

Name:	mfi_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansOutstandingPriceRangeLowerRangeLimitAsOfBeginningOfPeriod
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Share based compensation shares authorized under stock option plans outstanding price range upper range limit.

No definition available.

Name:	mfi_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansOutstandingPriceRangeUpperRangeLimit
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Share based compensation shares authorized under stock option plans outstanding price range upper range limit as of the beginning of the year.

No definition available.

Name:	mfi_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansOutstandingPriceRangeUpperRangeLimitAsOfBeginningOfYear
Namespace Prefix:	mfi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

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

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(4)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(g)

-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.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(f)

-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.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Net number of share options (or share units) granted during the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(d)

-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.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-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 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

-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.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

-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.