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

No definition available.

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- 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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- Definition

Description of funded portion of plan.

+ References

No definition available.

+ Details

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- Definition

Employee benefit plans.

+ References

No definition available.

+ Details

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- 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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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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- Definition

Employee Stock Purchase Plan, Termination Date

+ References

No definition available.

+ Details

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- Definition

Percentage of employee contribution as base for employer contribution to match

+ References

No definition available.

+ Details

Name:	mtrx_PercentageOfEmployeeContributionAsBaseForEmployerContributionToMatch
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Data Type:	num:percentItemType
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Period Type:	duration

- 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

- Definition

Percentage of plan funded.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- 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

+ Details

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Balance Type:	debit
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- 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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- Definition

Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA".

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (f)(1)

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947

+ Details

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Balance Type:	na
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- 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

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- 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 50

-Paragraph 2

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

Reference 2: 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=27012166&loc=d3e187085-122770

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

+ Details

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- Details

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- Details

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- Details

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Data Type:	na
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- Details

Name:	us-gaap_MultiemployerPlanTypeAxis=mtrx_PlumbersandPipefittersLocalUnionSevenFourPensionFundMember
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Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
Employee Benefit Plans (Details Textual) - USD ($)	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
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	$ 4,900,000	$ 4,100,000	$ 3,400,000
Employee share purchase limit aggregate market value	$ 60,000
Shares available at ESPP	1,000,000
Employee Stock Purchase Plan, Termination Date	Jan. 02, 2021
Shares issued under ESPP	13,243	5,440	4,452
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
Plumbers and Pipefitters Local Union Seven Four Pension Fund [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	Implemented