Condensed Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2013	$ 238,162	$ 279	$ 118,190	$ 141,427	$ (21,961)	$ 227	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	28,655us-gaap_ProfitLoss			28,254			401
Other comprehensive income (loss)	(1,940)					(1,940)
Payments to Acquire Interest in Joint Venture	700						700
Exercise of stock options	1,076		(1,057)		2,133
Tax effect of exercised stock options and vesting of deferred shares	1,597		1,597
Issuance of deferred shares	0		(4,482)		4,482
Treasury shares sold to Employee Stock Purchase Plan	76		11		65
Other treasury share purchases	(1,678)mtrx_OtherTreasurySharePurchases				(1,678)
Stock-based compensation expense	3,905		3,905
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2014	270,553	279	118,164	169,681	(16,959)	(1,713)	1,101
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2014	282,283	279	119,777	177,237	(16,595)	(182)	1,767
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(13,118)us-gaap_ProfitLoss			6,241			(19,359)
Other comprehensive income (loss)	(5,996)					(5,996)
Exercise of stock options	493		(275)		768
Tax effect of exercised stock options and vesting of deferred shares	1,764		1,764
Issuance of deferred shares	0		(4,628)		4,628
Treasury shares sold to Employee Stock Purchase Plan	215		94		121
Other treasury share purchases	(2,472)mtrx_OtherTreasurySharePurchases				(2,472)
Stock-based compensation expense	4,730		4,730
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	7,802						7,802
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2015	$ 275,701	$ 279	$ 121,462	$ 183,478	$ (13,550)	$ (6,178)	$ (9,790)

Other treasury share purchases.

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Amount of other increase (decrease) in additional paid in capital (APIC).

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This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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