Goodwill and Other Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Carrying value of other intangible assets
Gross carrying amount	5,664	5,664
Accumulated amortization	(1,030)	(581)
Net Carrying Amount	4,634	5,083
Intangible Assets Gross Excluding Goodwill	7,534	7,534
Total intangible assets	(1,030)	(581)
Total Other intangible assets	6,504	6,953
Minimum [Member]
Carrying value of other intangible assets
Useful life of intangible assets	1 year
Maximum [Member]
Carrying value of other intangible assets
Useful life of intangible assets	15 years
Trade Names [Member]
Carrying value of other intangible assets
Indefinite Trade Names	1,870	1,870
Intellectual Property [Member]
Carrying value of other intangible assets
Gross carrying amount	2,460	2,460
Accumulated amortization	(586)	(418)
Net Carrying Amount	1,874	2,042
Intellectual Property [Member] \| Minimum [Member]
Carrying value of other intangible assets
Useful life of intangible assets	6 years	6 years
Intellectual Property [Member] \| Maximum [Member]
Carrying value of other intangible assets
Useful life of intangible assets	12 years	12 years
Customer based [Member]
Carrying value of other intangible assets
Gross carrying amount	2,657	2,657
Accumulated amortization	(285)	(108)
Net Carrying Amount	2,372	2,549
Customer based [Member] \| Minimum [Member]
Carrying value of other intangible assets
Useful life of intangible assets	1 year	1 year
Customer based [Member] \| Maximum [Member]
Carrying value of other intangible assets
Useful life of intangible assets	15 years	15 years
Other Intangible Assets [Member]
Carrying value of other intangible assets
Gross carrying amount	547	547
Accumulated amortization	(159)	(55)
Net Carrying Amount	388	492
Other Intangible Assets [Member] \| Minimum [Member]
Carrying value of other intangible assets
Useful life of intangible assets	3 years	3 years
Other Intangible Assets [Member] \| Maximum [Member]
Carrying value of other intangible assets
Useful life of intangible assets	5 years	5 years

Intangible assets accumulated amortization excluding goodwill.

No definition available.

Name:	mtrx_IntangibleAssetsAccumulatedAmortizationExcludingGoodwill
Namespace Prefix:	mtrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Intangible assets gross excluding goodwill.

+ References

No definition available.

+ Details

Name:	mtrx_IntangibleAssetsGrossExcludingGoodwill
Namespace Prefix:	mtrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-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

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

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit.

+ References

+ Details

Name:	us-gaap_IndefiniteLivedTradeNames
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 42, 45

-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

Name:	us-gaap_IntangibleAssetsNetExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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