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Employee Benefit Plans (Details Textual) (USD $)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Employee Benefit Plans (Textual) [Abstract]
Percentage of limitation on pretax compensation		25.00%
Company match of first 3% of employee contributions		100.00%
Percentage of employee contribution for first half		3.00%
Employee contribution for next 2%		50.00%
Percentage of employee contribution for next half		2.00%
Contribution made by company	$ 3,300,000	$ 3,000,000	$ 3,100,000
Employee share purchase limit aggregate market value		$ 60,000
Shares available at ESPP		1,000,000
Shares issued under ESPP	4,395	699
Zone Red [Member]
Multiemployer Plans [Line Items]
Percentage of plan funded	65.00%
Description of plans funded	less than 65 percent
Zone Yellow [Member]
Multiemployer Plans [Line Items]
Percentage of plan funded	80.00%
Description of plans funded	less than 80 percent
Zone Green [Member]
Multiemployer Plans [Line Items]
Percentage of plan funded	80.00%
Description of plans funded	at least 80 percent

X

- Definition

Defined contribution plan employer matching contribution percent for next two percent of employee contribution.

+ References

No definition available.

+ Details

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X

- Definition

Maximum percentage of employee gross pay, by the terms of the plan, that the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtrx_
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Balance Type:	na
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X

- Definition

Description of funded portion of plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtrx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	mtrx_EmployeeBenefitPlansTextualAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Employee stock purchase plan per participant maximum annual share purchase limited to aggregate market value.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Employee stock purchase plan maximum number of shares available for issuance.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtrx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of employee contribution as base for employer contributions.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtrx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of employee contribution as base for employer contribution to match

+ References

No definition available.

+ Details

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Namespace Prefix:	mtrx_
Data Type:	num:percentItemType
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X

- Definition

Percentage of plan funded.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtrx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-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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Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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Balance Type:	na
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X

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 5

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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